I reused the old ones as they didn't come in the weatherstripping kit I bought.
I was prepared for a change in brake bias, but I was unsure what the difference would be. I know the MCM guys deleted the factory bias set up. Is the factory one adjustable? It appears to have an adjustment on it, but I am not sure what it does. I don't really understand why it has a factory valve like that anyway, with the twin style master set up, as I would have thought the factory would have just built in the correct balance? My plan is to adjust the factory set up if I can get the balance right that way, otherwise I can just add an aftermarket bias valve to sort it out.
The issue I have, like you saw in this latest one with the 260z struts, is that I don't really know what issues I am going to face until I get to it. Particularly as I don't know the history of the car, and I didn't pull it apart, so everything is just a matter of suck it and see.