cant see them pics dixiekid chap

get the 4wd arb that you know is the 4wd bar and lay in ton top of the 2wd bar and see what the differences are

one of them will have a different angle and some will have the bar machined further back than the other depending on what year it was made, what the guy doing the building was doing, what cololur the car was, etc, etc

soo many difrerences in the same cars that it was hit and miss what you had bolted ot the car and even though you could transfer parts form one to the other they would still be different

look at things such as the nushes on the arb to body mounts and how theyu dsit too as these can also make a difference

also check to see that thetcas are sitting straight and true and inline with the crossmemeber as this can cause handling issues in the future as nothing will loine up