Yes he has the orings they are all the same and he will replace them. You really should send him both boards and have him solve any possible issues before they start on the second board. He is a nice guy send him an email.
If you want to do it yourself you will likely succeed. We are nice (well most of us) too and help you DIY it. It is really not that hard. Just read half of the 5 million posts on the topic and you should be good to go.

 

I found a reconditioned board for sale, so I picked it up and literally just finished installing it. I haven't driven the car yet, as it's raining and the car is clean, but all the threads on here were a big help. Thanks to everyone.

The old board had a missing resistor, well maybe not missing as it was loose inside the housing.

I'll fix the old board up and keep it as a spare in case the other side decides to fail.

 

Seems to me you are reading off a tool that has definitions. Although I am sure you are trying to help, with the link in your signature I might get the impression that you are here to sell something and are spamming us. We don't take kindly to that here.