i got one off ebay which the seller said was from a 4x4. it fitted fine onto my car, which is a 4x4 shell with 2wd running gear. dunno if the 2wd shell has the captive nts in the chassis rails? anyway, it clears the 2wd crossmember and everything.

little tip for you - to fix it on, don't use bolts cos they're way too fiddly. screw some studding into the chassis rails and then the tray just pops on them and holds itself in place while you put some nuts on.