here is the one I'm talking about without the ballast attached and the right one for 73/74


http://cgi.ebay.com/ebaymotors/NOS-1973-...=item53e3e39a7b

not cheap, but mostly sure somewhere somebody will float on another one

or simply get the double stage one and done! will work the same

http://cgi.ebay.com/ebaymotors/NOS-37557...=item35b101fb06

I think in fact you can cut the ballast anyway and will work like a single stage, need to be sure though.

I have both kind NOS, will check casted number on white plastic to check if PN matches, and just service PN is diff due teh ballast