Hi, so I ordered a seat foam off ebay advertised to fit xs1, xs2, and 73 TX650. The 74 TX650 had totally different frame, etc... And yes, I have a 1973 TX650 with the flat rear peg assy, not the tubular style rear peg triangle assy as used on the 74 bikes. I received the foam and it is incorrect. I have looked at photos on the net and all show xs1, xs2, 73 TX650 having seat with the WIDE front and UPSWEPT seat trim towards the back. The foam I was sent looks like it is actually for the SMALL front 1974 and later bikes with the flat trim that has no upsweep towards the back. Vendor claimed that it was correct. I am not going to argue with vendor. Vendor claims others have ordered this foam and had no problems, but did say others had returned it. I kindly suggested they do some research and see the wide front style early seats, so they could avoid further returns. So, I REALLY need a seat foam for my bike. I cannot find the correct one anywhere. My bike is 100% original and I did the research to make sure I knew what I was talking about. I will attempt to post pics of my seat before and after disassembly. Can someone clarify if there is a part number or specific designation for this type seat? Were there two types of seats that came on these bikes? If the foam is unobtanium, I would consider making my own (messy), or using a different seat....but the hinges look to be very specific to the xs1, xs2, 73 tx650s. Havent seen any other seats with same hinge location/style.