yeah well the shoe wasnt the problem at least i hope not, cause im using the '03 Shimano 150 shoe which says on it spd-sl. The problem was, part of the cleat extended past the side of the shoe, just a bit. I needed to do that so my shoe wouldnt rub on my DA crankset (right Q factor width)---my Look cleats had no problems with the mounting style----these SPD-SL cleats seem a lot thinner and lighter than the Look equivalant----maybe they tried to lighten them up. If you check out cyclingnews.com's review on them, they questioned cleat durability.
Want: 58cm Cervelo Soloist. PM me if you have one to sell Vintage Cervelo: A Resource