Welters Farm Supply in Missouri might be a place to start, they handle Agco and what Agco doesnt have they try and source it somewhere. Their phone number is 417-498-6496. They are a busy place so if the line is busy just keep trying. They are very knowledgeable people.
 
So you've gotten good info so far. You can turn it to a 504. There are no kits as it were. You'll get a ring set a bearing set piston set ect. Welters, Clint stamm or possibly Charlie blier(sp?) Would be the guys I'd start with. I've never worked with Charlie though I've heard good things. Stamm and Welters are really good. Helped me with my g900 overhaul. I had .020 over pistons that were fine. My blocks were worn out about .090 over. Clint got me worn std blocks we bored them to fit my pistons and threw a set of rings in it. Runs great. Mine is gas though.
 
Reliance is selling this: RP994165 for 451 tractors. It seems that LP and gas have more parts available than Diesel
 

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