If you are spinni' em up on the lathe,
origionally they are .390 bore .560 OD and .250 length. +/- .010
Or you can go to the hwd. and get a 1/4" pipe nipple maybe 4 or 5 " long,
and cut the 4 spacers needed, 1/4 long.(hack saw/pipe cutter works)
You will 'prolly have to run a 3/8 clearance drill bit in the nipple first before you cut, as they usually run a few tho' small on the bore, and the bolt will not fit.
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