I don't have any, though I've done 2 monster tail swaps, if you need some advice, lemme know.

you can get monster seats all day on ebay for under 50 bucks usually. I do have a fancy aluminum monster rear seat cowl though. I'd let it go cheap. It's polished, but you could scuff it with a scotch-brite if you're not into the bling.

on a side note, that silver b12 is EVIL looking!