Need help with a measurement

[TA219]

The car that i am working on had some frame damage when i bought it and I need help from someone with a 67 or 68 camaro. I need to know how far apart the rear frame rails where they meet the rear inner valance.

If someone has the ability to take this one quick measurement from the inside of the drivers side frame to the inside of the pass side frame
l<--->l
it would help me a ton! Since the frame was bent when i got it i was never able to get accurate measurments.

Thanks

[jack67rs]

holding the tape against the rear panel the I.D. is exactly 43". centered under the spring perch holes is 42 5/8" I.D.

[TA219]

Thanks !!!