The round upper and lower rubber mounts for the transfer case have been discontinued..part# 547702 and #547704 and mine are shot. Where can I find a replacement part that can take its place and fit?..or can I just remove them and solid mount the 'transfer case mount bracket' to the transfer case? would I risk cracking the transfer case during flexing? I have intermittent vibration and can move the transmission side to side way to much with little pushing by hand..thnks guys