221 rubber mounts

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The rubber mounts for the xfer case on my 65 K10 are shot. I ordered new poly ones from one of the usual suppliers and they sent a Prothane 7-1603.Looking at old posts it looks like this is for the passenger side mount. If that is correct then I still need the drivers side. Looks like I may be able to use another set for that side, but both vendor and manufacturer are no help. If this will work where do the two thicker bushings go, top or bottom? Thanks for any help, Tom