I got a lever blade from Walridge 18/754 with the 7/8" pivot. I'm sure Mike has both sides. I got a bunch of nuts and bolts and one body, the brake that has the air lever I think from Britishonly in Michigan, but I had to hassle with them about the quality of it, the chrome was peeling, they finally sent me a good one. They had good prices though. The BA screws, some have large heads and some smaller which fit, you just have to try them. If you have the 69 Spares book, all the parts are listed and still good if you can find them.
There are probably better sets out there now, but I was going for original look.
I guess the 1" pivot would be harder to pull, but would pull longer. I never had any problems with my clutch, so I am going original at 7/8".
Dave
69S