Tractors - Cletrac to International Harvester |
| Manufacturer | Model / hp | Spark Plug |
| Manufacturer | Model / hp | Spark Plug |
| Cletrac | BG BGS 7/8" SAE fitting | 1 Com | Fordson | Major 7/8" SAE fitting | C-5 |
| Cletrac | AD BD DD FD | J-8 | Fordson | New Fordson Major | N=7 |
| Cletrac | BGS | H-10 | Fox | 18mm fitting | 7 |
| Cockshutt (Canada) | With Chrysler engine | J-8 | Fox | 14mm fitting | J-8 |
| Cockshutt (Canada) | With Hercules IXB3 / Buda 4B-153 | J-12 | Frazer | ---- | 8 Com |
| Coltmate | ---- | 7 | Glasgow | ---- | 8 Com |
| David Brown | ---- | 7 Com L | Gray | ---- | 1 Com |
| Eagle | Model 6A | 8 Com | Gunsmith | JAP Engine | L-10 |
| Eagle | Model 6B 6C | 1 Com | Huber | With Continental F-124 Engine | 7 |
| F.A.R. | 14mm fitting | L-10 | Huber | With Hercules IXB3 Engine | 1 Com |
| F.A.R. | 18mm fitting | 7 Com | Huber | Models with 7/8" SAE fitting | 20 |
| Farmer's Boy | 14mm fitting | L-10 | International Harvester | Farmall B64 | N8-B |
| Farmer's Boy | 18mm fitting | 7 Com L | International Harvester | Farmall A-1 AV B BN C H HV M | 15-A |
| Farmhouse | ---- | C-5 | International Harvester | Farmall MV Super A AV O-4 OS4 | 15-A |
| Ferguson | Continental Petrol Engine | 7 Com | International Harvester | Farmall O-6 OS-6 T6 W4 W6 BM | 15-A |
| Ferguson Petrol | TE-A20 TE-C20 TE-K20 TE-P20 | L-10 | International Harvester | Farmall Cub | 15-A |
| Ferguson TVO | TE-D20 TE-E20 TE-L20 TE-R20 | N-7 | International Harvester | 10-20, 10-20 Orchard 15-30 22-36 | 20 |
| Ferguson LO | TE-H20 TE-J20 TE-M20 TE-S20 | N-7 | International Harvester | Standard Farmall | 20 |
| Ferguson | TVO Conversion TE-A20 TE-C20 | L-8 | International Harvester | W-9 WR-9 | 0 Com |
| Fiat | OC140 | D-8 | International Harvester | F-12 F-14 F-20 F-30 | 1 Com |
| Fiat | 600 601 602 P 18mm | 8 Com | International Harvester | Fairway 12 & 14 O-12 O-14 T-9 | 1 Com |
| Fiat | 600 601 602 P 14mm | J-12 | International Harvester | W-12 W-14 W-30 W-40 | 1 Com |
| Fiat | 30 700 A 700C | 7 | International Harvester | WA-40 WK-40 | 1 Com |
| Fiat | 25C 25R 18mm fitting | 8 Com | International Harvester | WD-40 | 44 |
| Fiat | 55L starting engine | J-8 | International Harvester | TD-14 TD-18 TD-24 | 44 |
| Ford-Ferguson | ---- | J-12 | International Harvester | MD MDV ODS-6 WD-6 WD-9 | 49 |
