early vs late k-frame bolt pattern

Guys, he's asking for the front to back center-to-center measurement of the k-frame mounting bolts - not side-to-side

I got 12-5/16" on my '66 Dart and 12-7/16" on my '68 Dart. I was on my back eye-ballin' the tape measure with the cars on the ground though, so I'd say those numbers are +/- 1/8". Also, those are both on the passenger side. I didn't check to see if they're the same on both sides I'd assume they are, but who knows?

Hope this helps.