this is a complete paxton head unit . i beleive it is an sn92 with a 3 in pully. i purchased it for a 89 mustang 5.0 but never got the rest of the stuff to install it. it does have a homemade bracket that comes with it that bolts to a 5.0 head.the guy i purchased off said the bracket worked fine. i was planning on rebuilding the supercharger but it does turn freely.you can install this on about any vehicle if you make or purchase the brackets.this is sold as is . i dont want to sell but must to raise money for a motor for my stang.thank you good luck bidding us shiping only pulley is for serpintine belt serial #sn9215713