The back ones are torex (don't remember the size) and are lock tighted in that is why they are hard to get off. I use a long handled 3/8 flex head ratchet for the extra leveage.

Rich S

1998 SVT 1995 Contour 2.5 MTX 215K miles Son's car(dead and buried) 1997 Contour 2.0 ATX 1998 Contour 2.5 ATX 2004 Tauras Wagon 3.0 Duratec