Hi guys, i started reading this topic and was shaking my head. :x Finally towards the end of the topic most of the correct answers were mentioned. Guys, i mentioned and explained all of this on the Yahoo list (and maybe even on here, can't remember) when i was rebuilding my engine.
All SR20 rods are the same thickness width wise as the allowable clearance (axial movement) between side of rod and side of crank journal is quite small and the length of crank of a GTI-R and 200SX or SR20DE is the same length.
So, with the rods being the same width externally, it is the bearing width which is different (19mm wide for the GTI-R, 17mm wide for all other SR20 motors). There will not be 2mm of axial (side) conrod movement, its just that if the 17mm bearings are used on the R conrod the bearings will be offset to each half bearing shell (but it will still be within the external width of the conrod). If 19mm bearings are used on a SR20 conrod, well i'm not sure if the bearing will be sitting within the external conrod width, but the bearing shells will be offset to each other. I have physically seen 17mm bearings being used on stock GTI-R conrods, and shook my head when i saw it. :? It will work (as will SR20 conrods being used with 17mm bearings in a GTI-R) but it won't be ideal.
I know that people are trying to help others, but i get frustrated at the wrong info that gets posted on the net. :x My philosophy is if i have personal experience in the topic then i will comment, but if i haven't done it myself physically then i will normally refrain from commenting or mention something along the lines of that the info could not be all legit.
Not having a go at anyone at all, just pointing out some of my observations.
Ivan