As far as I know the 'fat' boosters were only on early model JDM models about 1990, and the check valve will be mounted on the booster body on those and I doubt if you could use it anyway with a later booster.
All the other boosters are 'slimline'
They all look the same except that the '90 model ADM cars had a 'slimline' booster with the check valve mounted on the booster body. They only used a 7/8 "M/C
Later boosters only have a hose neck connector on the booster body (see pic) and they all used a 15/16" M/C
With those, the check valve is mounted
in the engine bay on the intake manifold.
I believe that probably was done to give more volume to the vacuum system.
You can buy a 10 mm check valve that you should be able to easily insert into your existing vacuum hose on the manifold.
My car is an NA I have done that myself. I also have a later model booster with a Supra 1'' M/C
BTW, horrible brakes without the check valve as you can imagine, and there have been posts on the forum about that.
A check valve like this should fit, although I used a Honda one that looks about the same.
http://www.ebay.com/itm/3-8-10mm-Inline-Check-Valve-Fuel-Diesel-Gas-Liquid-Air-One-Way-Non-Return-/320985736550?hash=item4abc3da566:g:lm8AAOSwYGFUxOjj&vxp=mtr 