NP205 speedometer gear interchangeability

['63GENIII]

I just swapped out the T221 for divorced mount 205 in my '63. I have the mounting issues, driveline modifications finished as of today. I have exhaust to reroute, shifter design and speedometer to finish. I thought that the speedometer connection was going to be the easiest part but found out today that I couldn't be more wrong. I noticed early on that the steel "driven gear" that screws into the tail section of the Dodge 205 was missing and really didn't give it a second thought. Well today after I finished putting the gear lube in, I decided to look online for the driven gear thinking that GM, Dodge and Ferd all used the same one. Epic fail. It appears that the Ferd is a slip in style with a retainer bolt, I haven't seen the GM style yet and the Dodge is a screw in steel type which hasn't been made for a while and even used is tough to find. I guess I could possibly swap out the tail housing for a GM style and have better parts availability but I wanted to get some opinions and maybe even some pics of the GM ones that some of you have. Or better yet, if anyone has a Dodge style driven gear in good shape, I'd love to hear from you. Thanks for any advice you can lend. Chris