| Узел | Модель |
| (A32) - ENGINE, DOWNSWEPT EXHAUST, 990, 995 AND 996 TRACTORS, OPTIONAL EQUIPMENT | (990) - DAVID BROWN SELECTAMATIC TRACTOR (1/71-12/76) |
| (A12-1) - ENGINE, MANIFOLDS AND SILENCER | (990) - DAVID BROWN SELECTAMATIC TRACTOR (S/N 11070001 & AFTER) (1/76-12/80) |
| (A32) - ENGINE, DOWNSWEPT EXHAUST, 990, 995 AND 996 TRACTORS, OPTIONAL EQUIPMENT | (995) - DAVID BROWN SELECTAMATIC TRACTOR (1/71-12/76) |
| (A12-1) - ENGINE, MANIFOLDS AND SILENCER | (995) - DAVID BROWN SELECTAMATIC TRACTOR (S/N 11070001 & AFTER) (1/76-12/80) |
| (A32) - ENGINE, DOWNSWEPT EXHAUST, 990, 995 AND 996 TRACTORS, OPTIONAL EQUIPMENT | (996) - DAVID BROWN SELECTAMATIC TRACTOR (1/71-12/76) |
| (A12-1) - ENGINE, MANIFOLDS AND SILENCER | (996) - DAVID BROWN SELECTAMATIC TRACTOR (S/N 11070001 & AFTER) (1/76-12/80) |