My stock E struts only accomodate M calipers (3" spacing) so I expect Tom's in the same boat.
Tom, I completely refreshed the suspension on the E this past Summer and I have 21/26 t-bars and HD/Sport shocks. Our E is narrow bodied and it has 6"/7" wheels with 195/65/15 & 215/60/15 tires. It's a nice street / track compromise, except the 215's rub on the non-rolled rear fender lips.
Of course if I really wanted a track car...