The choices for 6 volt coils becomes somewhat limited. I've seen 6 volt Harley coils used and seen some choices on ebay of course. Depending on your battery choice now may be a good time to consider the 12 volt conversion ( as parts become a bit more plentiful ).
I'd also recommend upgrading the rectifier for something solid state (even NOS selenium rectifiers weaken and grow old sitting on the self) regardless of 6 or 12 volts. Oregon Electric has worked well for me (other conversions on are the web, Radio Shaft etc).
On other forums I've seen the use of GM auto coils but the resistance of the coil is not suitable for a points ignition system to be sure.
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