Merritt Saddle Box With Step 23.5”H x 28.5”D x 30”W Smooth Aluminum Door Model 488Merritt Saddle Box With Step 23. 5H x 28. 5D x 30W Smooth Aluminum Door Model 488 Note: Mounting Kit welded inside all 12, 18, 24 & 30 Saddle Boxes (bolts not included.) 36 Saddle Box must be mounted using external brackets (480 & 481 use bracket 117, 482 & 483 use bracket 118). Merritt builds some of the highest quality saddle step boxes in the industry. Whether you're a truck driver, owner, or a parts manager for an auto shop, you can't go wrong