Tony, I think that little tang on the rear seat support frame is ONLY on the CX500EC and the CX650 ED - the Sport/Euro models. I reported that something like a year ago, but I'll likewise check one of my CX500TCs in the near future. All four seats I have for 500EC's have wear marks at that hole in the plastic base-pan.
"E" and turbo seat fitment
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On the other forum, we had a disussion about the seat on the "E" and turbo not fitting properly. Here are a few pics taken at the amish rally showing the hook and the hole in the seatpan. After putting the hole over the hook, the seat is slid forward to engage the hook in the seat.
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