We have been looking at this as well. We too have a body shop and being a smaller store we have used our share of non-GM parts. Some times we are forced to use non-GM because it is either discontinued or GM simply cannot supply it. Galactic Backorder I believe is the term the guys now use.
Anyway, we have not been able to determine an effective policy / procedure that will insure we get this done every time. Like previously posted we too have the customer signing so many things they are questioning us why already... Now add another stating we may have harmed their vehicle. Why not just ask for the keys to the building and make it official -
