What is the length of C-body power window regulators (pivot to center of roller)? Can they be shortened to be used in a B-body (guy on ebay claims yes)? What's the correct B-body length?

Thanks

I do not know about the shortening question. I do have spare 68-70 B body power window regulators (you did not specify what year, I assume it is for the Charger in your avatar).

If no one gives the info you need in the next few days, I will look through my parts boxes this weekend to find the regulators and measure for you.

Yes, 70 Charger, your assumption was correct
That would be great! And let me know if you decide to let go of your spare regulators if I can't find a nice set there is always the Nu-relic option.

Thanks!