It's pretty well known the si had a variable rack, even has a VGR stamp on it and is a separate part # from the HF and DX which use the same rack, also why a quaife quick rack works with DX/ HF rack and not the si rack. I've driven all 3 models and owned Dx and si and there is most definitely a difference in the si, unless it had the rack replaced with a DX/HF rack. As for the gas tanks, I think someone screwed the pooch on the sizes as previously stated my DX would go from pushing into the gas station to overflowing in 9.5 gals, but my 91 si would take 10-10.5 not even getting to the bottom. I could be wrong on the tanks, but that's personal experience and not wikipedia
I like my women like my CRX. Short, sexy, and with a rear end that makes you say "I bet she handles like a dream"