The flange can be replaced with a yoke. I'll be doing that with mine when I get around to the gears. I don't have any info right now on what fits, but I suspect there are several options.

A quick search comes up with 28 and 30 spline pinions. I haven't counted mine since I haven't torn that part down, but I would be surprised if it wasn't 30 splines. Yokes are available in that count from Summit.

Thanks for the info, but I have already bought the axles for mine.

Mike