Hi
Here you have the seal dimension. If you want to go to SKF ones (not so cheap, but good) I can send you ref.
The weight will depend on what you want to do, I use 5.
How much, it's not the way to measure it, it's the distance of the oil from the top of the fork, with the suspension all the way down and without the spring.
You can make some tool like I've did, or even simpler with a plastic pipe, and a syringe.
The height will also depend on what you are going to do ?? off road / mx / supermoto ??
ZAGA