I'd google Buchanan's Frame Shop in Southern California, it might still be there, they were THE experts, and, any of the various spoke wheel rim manufacturers.
Another way is to look on the various online parts carrier's parts lists, like bikebandit, motogrid, others, and see what part numbers fit what.
In wheel lacing, there is a "cross" pattern used for all wheels. Lets say a wheel has a 2 cross spoke run, hole to nipple hole, it has one angle for the spoke nipple to "aim", and the spokes cross over each other twice. If it were a 3 cross, the angle of the nipple hole would differ, to allow for the different angle into it, from the hub, with, lets say, a 3 cross spoke run.
You have a rim there, no spokes, take a spoke and nipple and thread them together though a spoke hole. Now, seat the nipple do it comes out the hole in the rim without an acute angle from the hole angle. Where does the spoke aim? That would be one side of the hub it is supposed to use.
Now, lets say it is drum brake, 9 inch diameter spoke hole. Now, take the spoke and aim the hub end to fit say, a 6 inch hub hole, and look at the nipple as it sits in the drilled hole in the rim, is it square, does the nipple still sit square on the hole, proper angle, or, does it not?
I have not seen any hole angles in rims that are set up to aim at different hub spoke hole diameters, only what they are designed to fit.
ASK THESE PEOPLE, they've been doing this since 1958,
Buchanan's Spoke & Rim, Inc.
805 W. Eighth Street
Azusa, California 91702
Tel: (626) 969-4655
Fax: (626) 812-0243
Business hours - PST:
8:30 am - 6:00 pm Monday
8:30 am - 4:45 pm Tuesday
8:30 am - 4:45 pm Wednesday
8:30 am - 6:00 pm Thursday
8:30 am - 4:45 pm Friday
Closed Saturday and Sunday
Website: buchananspokes.com
Email: click the links below
techsupport@buchananspokes.com