Compressed it is probably more like a 1/2" or 3/4" of spacing, and it caused no interference with the exhaust, valence, diff, etc... No issues aligning the filler tube or getting the straps on either.
I have the fuel lines and filter secured to the hard lines mounted on the front side of the crossmember near the factory 4 tube evap rollover valve location.
The fittings clear the crossmember and the trunk floor.
I don't have any pics of it installed unfortunately.