Motor plate thought?

DrCharles said

Thanks for the tip :) It's not going anywhere with the bolt torqued down so the spacer compresses between the mount bracket and the washer underneath the rail. I made it nearly a press fit, too.
Wouldn't it be more inclined to move around if the top end of the spacer wasn't secured in the frame rail hole, though?

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no, because the top of the tube is clamped against the underside of the top surface of the frame rail which only has a 3/8 hole. the tube is bigger than 3/8. although your way should be perfectly fine if you were to for example side step the clutch pedal (if using a manual trans') the torque could move the tube elongating the hole in the top of the frame. welding the tube would of course eliminate any possible issues.
i like the poly bushed mounts by the way.
neil.