I just mocked up my 41 Pickup and noticed my two front leafs with matching paint that came for a 40 have the center pins in different locations to each other. I’ll get new springs made and drill the pins to my wheels base but the front of my chassis is a stock 40 and I’ve back halved it for the big tires. Working with a 100” wheel base at the moment but that could change a little, we’ll see.