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| Model | Champion Plug | KLG Plug | NGK Plug |
|---|---|---|---|
| All A50, A60 (Standard Plug) | N-3C | FE100 | B9E |
| All A50, A60 (Hot Plug) | N-4C | FE80 | B8E |
| A65T | N-4C | FE80 | B8E |
| B44 | N-6C | -- | -- |
| A7, A10GF, B31, B33, B32 Cast Iron | L82C | -- | B6HS |
| Bantam D1, 1954 onwards, M21 Cast Iron | L86C | -- | -- |
| A7SS, A10RGS, A10RR, A10SR | N-4C | FE80 | B7ES |
| C10L, C15, C15T, M21 Alloy | N-5C | ---- | B6ES |