Just saw this advertised: I have not ordered it etc.
Tin works Fabrication offers a c notch kit with body mount as part of the bracket for the squarebody suburban. This might be the first mass produced kit for this?
https://tinworksfabrication.com/prod...body-suburban/
http://https://tinworksfabrication.com/product/1973-1987-rear-c-notch-kit-squarebody-suburban/