Product review (5 stars): Fits the bill and gap
Purchased the Capparis Kitchen Silicone Stove Counter Gap Cover to protect spills in the gap between the oven and the counter. Researched other silicone covers for about the same price but was sold on the Capparis based on reviews and fit. It's 21" which is the right length from the back of my oven to the front of my counter. When purchasing one of these, make sure that it's long enough to cover the back of the oven to the counter. If the gap cover is longer, you can always cut, it, but if it's shorter, then you'll have to buy another set.

My oven actually sits a little higher than my counter even after adjusting the oven's feet. I still ordered the gap covers to see if it could still fill the gap (pun intended). Obviously, if my oven was flush with my counter then the gap covers would sit as it was designed to, but since it doesn't I had to improvise. I know that no other gap cover would make a difference since they're all pretty much designed the same. Fortunately, the silicone is nice and sticky so it adheres to the oven and my counter while still covering the gap (see pictures). I was still able to tuck in the middle piece of the gap cover between the over and counter, but the flap that should sit on the top of the oven is sitting more on the side of the oven (see pictures). Only issue here would be build up of crumbs that would sit on top of the flap, but at least they won't fall between the gap.

I'm still giving this product 5 stars as it was designed to do what it is supposed to if your oven sits flush with your counter, but if it doesn't the gap cover can still prevent crumbs from falling through the gap if you install it as I did. So don't fret, and just improvise and for $10, it's not going to break the bank. The quality of the silicone is really good too as I stated previously, really stick underside and won't slip and matte finish on top that can easily be wiped down and cleaned.

Overall, a good product that will keep your kitchen clean from dirt and crumbs falling between your oven and counter or other household appliances.