Ok I have done a search and nobody on any of the threads has yet to answer this question and it seems it's been a while since it was asked.

I need to know what thread size is on the b&m megashifter. I have an 87 IROC and I just got a killer looking flameball and it's too big. I need to know the right size so I can have them send me the right one.

Thanks in advance guys!