The answer to your second question is on the first page of this thread. I don't know the answer to your second. I could have measured some axles directly, but they got thrown away earlier this year(severely rusted from a flooded outbuilding).
i just did the explorer swap.did'nt care for the offset so i cut the long side off and got another short axle for it.worked out nice now all i need is wheels! it came from a 95 model with 3.73 ls and disk brakes.i took