The bonding bushing only needs to be at one end. The two locknuts (for a GRC nipple) on the other end make it electrically & mechanically continuous.
Best way to avoid needing the bushing (sometimes a grounding locknut will work) is to use PVC when possible, except in Clarksburg with that dad blasted third ground rod.
As far as 250-92(a)3 is concerned, if the job specs don't specifically call for additional protection of the GEC, use one big enough to withstand a little abuse so you don't need the conduit. When I lived out west, we used to be able to buy a ground rod clamp that would connect a 1/2" GRC to the rod & provide a connection for the GEC. It was made of malleable iron &I believe they were called "Terry Clamps" (brand name). Haven't seen them since I moved back East. You ever seen them?
[This message has been edited by Tom (edited 04-09-2001).]
Few things are harder to put up with than the annoyance of a good example.