After speaking with Baer extensively over the past week they have been VERY specific about '70 - '70B/'70 - '74E body disc brake spindles, and never have they mentioned the drum brake spindle. Doesn't mean they don't make a kit, I'm just going off the information they're providing me.
One thing...
Looking specifically for a pair of '70 - '74 E-Body disc brake spindles with the 1.250" diameter inner bearing journal, we cannot use the later 1.375" inner bearing journal (Baer brakes won't fit them).
If you happen to know anyone manufacturing aftermarket "small journal" spindles I'd love to...