I was a bit nervous ordering with a new supplier and was going to submit a sample order first but decided to bite the bullet and order 1000 pieces straight away as they were a simple part and the mold cost was most of the price. They've just arrived and were perfectly to spec in both dimensions and the durometer of silicone requested (20A). Glad I got this company to produce the part and trusted them with the order. Will use again. Thanks, Sam for the quick replies to messages as well.