disk road wheel hub cap studs - TR4

Does anyone know where I can obtain, or perhaps have a suggestion for 
making some replacement studs onto which the hub caps snap ??  I need 6, 
and none of the big 3 catalogs seem to list them.  I thought about maybe 
trying to 'turn' some using maybe brass bolts (brass = softer, and I 
don't have a metal lathe).
Any suggestions other than to buy 2 new disk road wheels ?

Thanks for any help.
Bud P.

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