Hello, all, hoping someone can help get me sorted out here. I'm trying to retrofit my 1999's seat back to stock from a Corbin , which came with the bike. I got an '03 seat to fit the bike perfectly, but can't mount the seat cowl now. I understand there's a difference in hardware between early and later models, can anyone tell what I have from the pictures here? The pins are WAY too large in diameter to go into the socket. Thanks!
Socket in the seat

socket removed

The pin that is too big