An older version of this site had a very useful cross reference for filters, belts, hoses, etc which I am not able to find now. I did retain a printed copy of this cross reference from 2006 which listed 2 Gates fan belts: A37 and A38. Having just replaced the fan belt on my Jinma 284 with Y385T engine, I found the Gates A37 belt to be too short but the A38 belt fit perfectly.
Jinma 284, logging winch, post hole digger, pallet forks, backhoe, back blade