I'd opt for GXP seats for the 40th if I were going to swap, but if you want to keep stock seats then might have to look for a low mile 40th and grab the seats out of it. Only other option would be to have them redone to keep it original.
Clean rides btw. Really like the 40th.
Here's a link to info on the SE lip--> http://www.grandprixforums.net/threa...1-SE-Front-Lip!