[maple_leaf_eh]

It stands to reason that the earliest civilian Jeeps were based closely on the M38A1, but ... there were enough changes to make that assumption weak. Twenty-four volts, oil bath air cleaner and slave-cable wiring to name a few parts differences.

From the illustrated parts manual:
bolt WO 54073 (from the manifold to the first length)
gasket WO 634814
nut WO 801681
pipe WO 649869 (ie short pipe)
nut WO 801678
gasket A7967
bolt WO 54059
extension assembly WO 805779 (ie long pipe)
bracket WO A15498
muffler WO 649865
bracket WO 800799

If the CJ parts book has numbers that look like these, then you might be in luck. Otherwise, I don't have any suggestions.