Unlike the other reel manufactures that used penn parts, Lee Pro built their own and a 4/0 bridge will nor fit. The holes for the screws line up but when it is in place the shaft for the gear is way off center.
Interesting. Could you send me a picture of the sideplate? Not sure Lee pro did this but I know accuplates had magnum versions of reels that used different internals like a 500 magnum used 4/0 parts and a 4/0 magnum used 6/0 parts