I purchased this pad for my father-in-law's Nova Model 4203 Walker. Whoever designed this pad certainly had no idea of the proper location for anchering it. As stated by another reviewer (4200), the holes do NOT align with either of those in the Walker's Seat. So, you're left with one of two options (other than returning it). One, you can attempt to measure those in the pad and drill new holes - hoping to get the correct positions; or two, you can simply glue it. I elected to glue it - but be careful not to place the glue too close to the existing holes in the walker seat. If you do, when attaching the seat pad and placing a little weight on it, the glue may drip out of those holes. The Seat Pad, itself, fits just fine and makes the walker much more comfortable. In fact, I don't know why Nova does just build their walkers with it in the first place - like they do with their 4202 model. If they did, at least they would know that the anchers are in the wrong location and have far too small a head to work without using washers (not included). Also, you'll need a small 'allen wrench' to remove/ancher the supplied (Hollow Set) screws. These, too, are a poor choice, as the use of phillip head screws would have been much more customer friendly.