68 lwb axle seats

[68c20lwb]

hello, i am in a pinch. my axle seats or trailing arm mounts, i believe they are the same thing, have rusted and are causing the rear axle to dog walk all over the place. i have started to make my own out of 2x3 pieces of square tubing. to finish this project i need to find the measurements for the seats/mounts. LxWxH and hight from bottom of mount to bottom of axle, also the diameter of the axle hole to set the axle in? thanks for your help, this forum is so great!