The problem with that BM part from Rimmers is that it's not genuine. I ordered one from them for my 3 door. It turned up and seems basically like rubber cable covering for floors to stop trips. With a bit milled out for the door recess. And a rounded bit poorly glued on for the end pieces. I was very disappointed with the look and quality. Which is why I held off from using them, and managed to eventually find a genuine kit for £40 on eBay brand new. ( I think there is another post about how poor the Bearmach version is on here somewhere).
When the original parts were available they were about £30 each. Making the cost of a full genuine kit look good value.
Should you buy it? If the cosmetics are important to you, then you'll have to do some hunting around or be patient for a genuine part/kit to come up. If not, it's a breakers job, which I'm sure could not charge too much, and you'll just have to get the tape to reapply it onto your door. If it were me, I think I'd be looking at that option to get a part to match the rest of the rubbing strips.