OEM and aftermarket track bar bushings same size?

Im getting a used adj. track bar next week. It needs a new bushing (axle side) and I need to know where to get one, what size, etc. I would like poly but Ill take what I can get. He said he thought it was an RE track bar. Thanks guys for helping w/ my DW prob. next will be control arm bushings.

No one knows or no one cares? ............. Ive got a 4 hr. drive on the 15th, I would like to get this fixed!