PST tubular strut rod install?

Trying to install these and the socket head cap screw that suppose to go through the lower control arm is too tight? I think if I use a big allen wrench I could probably kind of force thread it through, but I don't want to mess these up? Is there a difference between an a b c e body lower control arm regarding that hole size and could they have shipped me the wrong part, or should I just take a rat tail file and open the hole in the casting up? Anybody else here have an issue installing these??