I was desperate to find this locally for my 2G GSX once before. So after spending time with a longtime parts man at Oreilly was able to find one in stock. But only in stock at hub stores. Their system list the parts incorrectly at all different parts stores they try to sell us the GST
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pump gasket which we know is incorrect. The locking part number for GSX is Z14000 Precision brand. Here is a picture of it when I got it. Was about $10 in 2020