Which Master for Vac Brakes? (Pic)

[HighMileage]

I’ve had my GN for about 15 yrs. It was vac brake swapped with all new parts before I got it. Now the master is leaking from the rear seal.

Which master cylinder does this look like? Is it one from an 87 Monte? Thx.

 

[wdxwrx]

I believe any G-Body master will work. Other than the Power Master, the rest of the TR brake system is identical to the vacuum system.