Shop Inventory › Model A Johnson Cold Manifold A30 Image 1 of 4 Image 2 of 4 Image 3 of 4 Image 4 of 4 Model A Johnson Cold Manifold A30 $100.00 Johnson Cold Manifold, Part# A30. Good solid used manifold. This is used on the 1940-1947 Model A Tractors. Add To Cart Added! Johnson Cold Manifold, Part# A30. Good solid used manifold. This is used on the 1940-1947 Model A Tractors. You Might Also Like Quick View Model G All-Fuel Manifold $150.00 Quick View Model G Gasoline Manifold $200.00 Quick View 720 730 LP-Gas Exhaust Manifold F3041R $150.00