You need to know the current axle flange to axle flange measurement of the overall rearend and current brake standoff. Brake standoff is the measurement from the axle flange to the caliper bracket mounting surface. When you order axles, you order them with the correct brake standoff (tell them you are using flush mount ends). Overall axle length should be the same a stock.
That should make it easy on the rearend guy to place the new housing ends in the correct position. He'll just measure off the existing axle flange back to where the new housing end will weld on.
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