One new replacement front exhaust manifold fits John Deere models: 4050 4250, 4350, 4430, 4440, 4450, 4455, 4630, 4640, 4650, 4840, 4850, 8430, 8440, 8450 Combine/Forage Harvesters with 404 or 466 engines 6600, 6602, 6620, 6622, 7700, 7720, 8820, 9940, 9950, 5200, 5400, 5440, 5720, 5730, Industrial: 644C, 644D, 648C, 690B, 690C, 690CR, 693C, 740, 740A, 770A, 770B, 772A, 772BReplaces Part Number: R56995 Models This Part Fits: 4050 4250, 4350, 4430, 4440, 4450, 4455, 4630 Reference Numbers: AR54563, AR54563-A, R50391, R50391-A, R56695, R56695-A, R56995, R56995-A