One New Aftermarket Replacement Exhaust Pipe that fits John Deere Tractor Models: G (Serial Number G13000), GH (Serial Number G13000), GN (Serial Number G13000), GW (Serial Number G13000) Use with F552R Manifolds Casting Number F552R and AF1323R Manifolds Casting Number AF1323R. Use with R21826R and AA2214R Mufflers. Dimension A (1) A: 2-BOLT INLET Dimension B (2) B: 15″ VERTICAL LENGTH Dimension C (3) C: 23″ HORIZONTAL LENGTH Dimension D (4) D: 2 1/2″ OD OUTLET Replaces Part Numbers: AF638R, DRE-3 Reference Numbers: AF638R, DRE-3