They have aplate that mount under your carb/throttle body,just like a spacer,that has tabs that the straps go into.Then(most of them)have brackets that bolt onto your header bolts that have pull pins that the straps route thru.Pullpins allow you to pull the thing apart without removing any brackets.My buddy just got one for his FED,found it cheap.Like $250.It os SFI approved,and when they run out of date,you just buy more belts,not the whole setup.I THINK the company he got them from was DEI,not sure will find out and let you know.He has a 250 Powercgarger,and it took the same as a 6-71.I don't know about a 177.They have a 4150 stlye mounting pad cast right into it.Might ba hard to get that one :cry: We'll see what we can findout.You like your 177?Borrowed on from a friend.Put it on my 496 and it feels like it killed it!Just can't get it to run right.Got any secrets about the mini-blowers?