Originally Posted by finagle69

You have that backwards. Lower number ETs mean the wheel is further out from the hub-face. Spacers would only exacerbate the problem.

Some people who run spacers on the OEM 20x11 ET 37 wheels, however, run 20+mm spacers. This would mean that the 20x10.5 ET 27 would actually fit without an issue, but you'd want extended flares for it not to look strange.

The fronts would be pushing it even with the extended flares. I'd think it's very possible to have them fit, though.