55.2-59 235 distributor gear

[Virginian]

If this has been answered before, I can't find it. I have a spare original distributor for my 55 chevy 235 I want to convert to HEI, I can do it all except this distributor has a broken drive gear and I have searched and searched the internet for a replacement gear with no luck, is there anything that will cross reference over I see a lot of replacement distributors for sale with new gears but where can I buy just the gear ?

Thanks