Hello guys-- I have purchased a 1976 Ford P/U that the previous owner installed a 1985 OM617 engine. This truck runs great, drives great, but the vibration at idle is too much. The PO used rubber biscuits between the engine brackets and the frame and then bolted it all up tight! I can install stock 300D mounts but I don't know which way to oreient the bolt holes on the mount. Also can someone tell me the size of the bolt that goes thru the center of the stock mount and into the engine bracket?

Thanks for your help!