versatile suv crates are a little different from regular midwest double door crates in that the doors are on each end of the crate. the sl36suv is the direct replacement for the 606ss, and the sl42suv is the replacement for the 608ss note: suv crates are specialty crates, measuring either 36″l x 21″w x 26″h, or 42″l x 21″w x 30″h, and they have a door on each end. midwest suv crates are designed to fit side-by-side in the back …