Has anyone mounted a MGX-21 seat on a Eldorado? I need a more comfortable seat for my Eldorado and my options are limited. I would consider a Corbin MGX-21 seat if it would fit. I don't want a California seat on my Eldorado. Sargent wants $540 to rebuild my stock seat and they don't remove all the foam. They only carve out some foam and add theirs. I need suggestions.