On my 1999 Chevy Silverado 2500 I am in the process of removing the old rusted through frame and installing a refurbished frame. I noticed the replacement frame is missing a bushing (right side frame) where the right side of the front differential mount bracket ( GM part number 23229694) attaches. GM told me this bushing is not listed, but was a part of the frame. Does anyone know a form/fit/function bushing that may work?