The 1.81" shoulder fits inside the rear of the head - might be best to use that for ID. Look at the crossection lower right of diagram below.
I don't see why not Cal. It would essentially be a spacer. 1.24 ID & 1.81 OD about a 0.5 to 0.75 long. The thrust shoulder is where it narrows to 1.24, so Cal has the easiest solution!
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