Hey Mo. I have a seat cover on my 550 from that seller. I got it like 4 or 5 yrs ago....so they may be different now, but they appear to be made the same way as what the pic shows. My seat is black with white (or is it silver?) lettering on the back. It was a seat cover only....no chrome strip around the bottom.
The vinyl material is very thick and durable....much thicker than the stock material. That is either a plus or a negative depending on what you are looking for. It does not necessarily look stock because there is no pattern heat pressed into the top surface like the original, and the vinyl is a bit glossier than the original....but all in all, it has held up well and still looks new all this time later. As I recall, it came with a new seat strap made of the same material, but it was not reinforced like the original. I ended up using my original seat strap after cleaning it up a bit and it matches well enough to look good. The cover fit well and I had no trouble installing it. Rather than using the method they suggest of poking the little sharp points through the cover underneath, I used lots of short self-drilling screws and washers and essentially screwed it to the underneath of the pan as I pulled it tight. This made it much more secure and kept it from getting any wrinkles.
I can snap a pic of mine if you want to see it....but it looks pretty much like the pic in the ad. Hope that helps.
Edit: I did find a couple of pics that I had here at work. Not necessarily of just the seat, but does show the material/texture pretty acurately....

