1966 4000 Master Cylinder

[animalsservicar]

howdy folks , I have a new to me 1966 GMC 4000 that needs a master cylinder.
I have been searchin online & at my local NAPA & have been unable to find any listings for a 4000. any idea's ? are they common to the smaller trucks?
it is a V4000
tks
animal

[LEWISMATKIN]

FOUND ONE FOR YOU AT AUTOATLANTA.COM. P/N is 130.80018 and has the brake side at 1 1/4" and the clutch side at 1 1/8". Napa also has rebuilt unit p/n p34956 available as well. Good luck.

[animalsservicar]

thank you . Got a call today & my brake guy got me kit's , so I hope to be runnin & stoppin this weekend
tks again
animal