the 'ie' models all have the thicker trellis frame Chris( 620/750ie/800/900ie/ S4 & 1000)
All carbed models (as far as we are aware) have the identical dimensions of frame - 600/750 & 900).
Be careful with the 750 & 900 frames - and do check they were from carbed models if going down this route (pre 2002 ish. I say from then, cos there was an overlap of carbed & injected models from late 2001 to mid 2002 - and even later if sitting around in showrooms)
HTIOH
C
