70 DUSTER MEASUREMENTS NEEDED exhaust

Does anyone know the measurements from the transmission crossmember to the rear axle , thinking about just doing my own exhaust all the sudden and im not home near my car lol. in town at work and was going to have exhaust pipes cut then work on it tonite. plans are just dumping a short flow master super ten (13 inches long) with a small turn down before the rear axle or close at least. just didnt know about how long the distance is from tranny crossmember to close to the rear axle. if anyone could help i appreciate it. thanks...sorry for the poor planning when i could measure it tonite, just wanted to have pipes cut and ready for when i get home lol thanks for any help

zach