All these atv's are exactly the same,Linhai,Massimo,Loncin, there's more.One of the right side cover gaskets I ordered was for a Massimo 400,exact same part number,exact same gasket that this one uses.Here's one of the one's I ordered off Ebay:
https://www.ebay.com/itm/235534845566
Gasket of Right Crankcase Cover for Massimo MSA 400 T-Boss 410 BUCK 450 ATV/UTV