Seat Covering Help...

OK - HELP - I have PUI seat foam covers and there was NO instructions with them - matching them up with the old ones it seems like I should shave off the top - however i dont want to do this without real true instructions.... secondly even using the plastic bag method - I just ripped the bottom portion of the vinyl... my wife can patch it and its where you wont see it, but still I'm getting close to tossing $600 down the toilet... HELP....

A plumber cant help with the car seats LOL
I've done my share of bad mouthing PUI already so I wont go there.
I wouldn't expect another vendor like Legondary to provide any support on anothers products.
Areas where the foam is shaved will get a piece of muslin fabric glued over it . This serves to smooth the edge lines.
My best suggestion is take the works to a local shop. They will have enough experience to make it go together for you regardless who made or sold it.