Tractors - Allis Chalmers to Cletrac |
| Manufacturer | Model / hp | Spark Plug |
| Manufacturer | Model / hp | Spark Plug |
| Allis-Chalmers | All 14mm fitting | J-12 | Brockhouse | Cultmate | 7 |
| Allis-Chalmers | All 7/8" SAE fitting | 1 Com | Brockhouse | Plowmate | L-10 |
| Allis-Chamers | 'B' Tractor (Kerosene) | J-12 | Brockhouse | President | L-10 |
| Austin USA | All 18mm fitting | 8 Com | Brockhouse | Hoemate | N-8B |
| Austin USA | All 7/8" SAE fitting | 1 Com | Case | Model LA | J-12 |
| Austin USA | With Waukesha VIKH Engine | D-8 | Case | Model DEX | 1 Com |
| Austin USA | With International PD40 | 44 | Case | Model DC4 | 7 Com |
| Avery | With Hercules IXB & ZXB Engine | J-8 | Caterpillar | All Ford engined models | A-25 |
| Avery | With Hercules IXK Engine | 1 Com | Caterpillar | All other Combines 7/8" SAE heads | 1 Com |
| Avery | With other Hercules Engines | 0 Com | Caterpillar | All petrol tractors | 1 Com |
| Bale-O-Matic | ---- | 8 Com | Caterpillar Starters | Starting Engines for Diesel tractors | See Below |
| Barford Agricultural | With Ford Engine | L-10 | Caterpillar Starters | 35 40 50 60 65 70 75 | See Below |
| Barford Agricultural | With Villiers Engine | 8 Com | Caterpillar Starters | RD-6 RD-7 RD-8 | 1 Com |
| Bates | 35-6S, 40 | D-8 | Caterpillar Starters | D2 D4 D6 D7 D8 DW10 RD-4 | 15-A |
| Bates | Model G | 20 | Caterpillar Starters | DW20 DW21 | J-12 |
| Bates | All other models | 1 Com | Chase | Dumper | 7 |
| Bean | ---- | L-10 | Citroen | All 18mm fitting | 7 Com |
| Blanch-Lely | 'Revolution' | N-7 | Citroen | All 14mm fitting | J-8 |
| B.M.B. | Plowcrop | N-8B | Cletrac | A & E Petrol | 1 Com |
| Bristol | AF, 28, 35 | L-10 | Cletrac | Paraffin | 20 |
| Bristol | TVO & petrol 3/4" reach | N-8B | Cletrac | HG, OC-3 7/8" SAE | 1 Com |
| British Anzani | Iron Horse 3/4" reach | N-8B | Cletrac | AG CG DG EG EH EHG EN FG | 1 Com |
| British Anzani | 1951-on JAP engine | L-10 | Cletrac | GG 15 20 20C 25 30G 35 40 | 1 Com |
| British Anzani | Twin 2-stroke engine | L-10S | Cletrac | 40-30 55 80 | 1 Com |
| British Holder | ---- | 8 Com | Cletrac | AG-6 | 8 Com |
| British Wallace | ---- | 8 Com | Cletrac | BG BGS 14mm fitting | J-8 |
