You need to find out from whom these vendors obtain their parts, then do a price comparison. Steve's Camaro states his are the best and made in USA. Quality changes periodically. Some have had good reports on Repops. I've used PUI and they were OK, but I am trying Repops on the next job. I always check return policies if the part is not satisfactory. I will not foot the bill for parts that do not meet my requirements. If the felts do not have the correct flap for the quarter windows, I would not buy them.