posi unit?

i saw on ebay a 2 series posi unit for a 92 z28. will this fit a 94 z28? i also saw one from a 94 on there and it was a 3 series. is there a difference? thanks

No it will not fit and yes there is a difference. Just try to get the one from the '94 that is a 3 series since that is what you already have.