Success!
Well at least I think so...
Side by side pics show the OE bushing has a slightly tapered head - the McMaster bushing does not - but it will work out just fine.
McMaster bushing has slightly smaller OD so the flat side sits nicely in the OE washer and the radiused side fits nicely in the radiator bracket.
My OE bushings are pretty far gone so I'd only be guessing at what their original height was, but comparing my used ones to the new rubber ones and it's about even on height.
You actually have two options from McMaster that will be good substitutes for the radiator bushing replacement:
Either you get one pack of 10qty RUBBER bushings for $8 and you will have to bore out the ID for the OE bushing bolt.
http://www.mcmaster.com/#9540k36/=tf6ws8Or you get 8 of the following POLYURETHANE bushing for $8ea and it should be a bolt on affair - no ID re-drilling required.
http://www.mcmaster.com/#9306k38/=tf6vfq