Looks like everything is out of stock on the site you mentioned. I found the proper seal kits at Amazon and of all places, WALMART! I should have enough seals here by next week to rebuild both calipers. Unless they do the ECS trick and tell me next week that they are out of stock for another 6 months
See if you can measure the ID of the pistons....I can determine the piston OD from that and confirm you have the correct parts. Looks like you've got the wrong sizes, they should go in relatively easily. Its not too hard to squeeze one size larger seal into the seal groove and get the pistons in...so I suspect this is what happened.
And these dudes have closed their shop down as far as I know. They started as 4 guys who liked racing their cars and decided to spin up the business to help keep the cost of brake repair parts low for themselves and other racers. As will happen, life changed and some of the guys went in different directions, etc. Not sure why the site is still up. It's too bad because they were inexpensive and shipped very fast and took care of you if something was wrong.
We are back!
Hell yes! And DAMMIT! I just bought seals for my Stoptechs last week. LOL. Don't worry, I will destroy them soon enoughWe are back!