Fitment Guide

Why fitment matters on these tractors

Farmall and McCormick-Deering tractors from 1921 through 1939 were built over almost two decades, across several factories, with running changes that weren't always documented. The same model name can hide two or three meaningfully different parts depending on:

  • Year built — early F-20s aren't identical to late F-20s
  • Serial number range — IH revised castings, threads, and dimensions mid-production
  • What previous owners swapped in — a 90-year-old tractor has usually been apart more than once

This means that a part listed for “F-20” may fit your F-20 perfectly — or may need a small adapter, or may not fit at all. When in doubt, call us at (814) 226-9200 before you order. We'd rather spend ten minutes on the phone than process a return on a freight-shipped casting.

What we sell

Every part on this site is new old stock: manufactured to the original IH specification decades ago, kept in the original packaging, sold today. These are not reproductions and not used parts. Where we know the original IH part number, it's listed on the product page — that's the most reliable way to match a part to your tractor.

If you have an old IH parts book or a part with the original number stamped on it, send us that number and we can confirm a match faster than any photo.

How to identify your tractor

To order with confidence, you need three things: the model, the serial number, and (ideally) a photo of the part you're replacing.

Model

If you don't already know which model you have, it's typically cast or stamped into a major component or printed on the data plate. The general families we stock are:

  • Farmall: Regular, F-12, F-14, F-20, F-30, A, B, C, Cub, H, M, MD, 154 / 184 / 185
  • McCormick-Deering: 10-20, 15-30, 22-36, W-12, W-14, W-30, W-9, WD-9, W40 / WK40

Serial number

The serial number plate location varies by model and year. On most Farmall and McCormick-Deering tractors from this era, the number is stamped on a small metal data plate riveted to the tractor body, or cast directly into a major component (engine block, transmission housing, frame rail). It may be painted over, rusted, or covered in grease.

If you can't locate yours, take a few photos of the tractor (front, side, and the area around the steering column or transmission) and we'll help you find it.

Photos and measurements

For any part where fitment is unclear, send us:

  1. A photo of the part you're replacing, ideally on a clean surface with a ruler or tape measure next to it
  2. Any markings on the part — cast numbers, stamped numbers, paint colors
  3. A photo of where the part lives on the tractor (with the part installed, or with it removed and the mounting area visible)

A measurement of bolt-hole spacing or shaft diameter is often enough to settle a question that words can't.

When you call or email

Save us both a round of phone tag — when you reach out, have ready:

  1. Tractor model (F-12, W-30, MD, etc.)
  2. Serial number if you have it
  3. The IH part number you're looking for, if you know it
  4. What you're trying to fix — a sentence about the symptom often helps as much as the part name
  5. Photo or measurement of the part you're replacing, if you can

Phone: (814) 226-9200 — evenings (Eastern Time) are best
Email: riceequipment@hotmail.com

Common fitment pitfalls

A few things that catch people out:

  • “It looks the same” — many IH castings look nearly identical across two or three models but differ in bore, bolt pattern, or shaft length. The casting number is the source of truth.
  • Mid-year revisions — IH changed thread pitches, gasket profiles, and bearing sizes between serial number ranges without renaming the part. If your tractor sits near a known break point, ask.
  • Previous owner swaps — if your tractor has a “wrong-year” component already installed (an F-30 transmission in an F-20 chassis, for example), the fitment of related parts follows the component, not the model badge.
  • Reproductions in the field — reproduction parts sometimes circulate alongside originals and may not interchange cleanly with NOS. If you're replacing a part that itself may not be original, mention it.

What we can't help with

We sell parts. We don't:

  • Do repair work or tractor restoration
  • Sell whole tractors
  • Ship internationally without a custom quote — email us with your country and the parts you need
  • Identify a part from a vague description (“it's the round one near the engine”) — please send a photo

Still unsure?

That's exactly why we answer the phone. (814) 226-9200, evenings Eastern. If we don't pick up, leave your name, tractor model, and what you're looking for — we'll call back the next day.