Clarification on Frt. Brakes Please

[ck5566]

Some YOYO from Rockauto is trying to blow smoke up my wazo by telling me I ordered the wrong wheel cylinders. I am trying to return the wrong ones that's where the smoke n mirrors come in. My truck is a 70 C10 standard brakes 11"x2" w/1 1/8" cylinder bore in front. *" Any & all"* books/catalogs & parts stores have confirmed there Standard brakes. I even sent to them pictures of mine with correct Brake Shoe Anchor Pin *" locking flat washer"* setup & also showing what they sold me. **** Here's there answer I must have HD heavy duty brakes. 1st pic is mine with correct fit, 2nd one definitely wrong & 3rd is almost good with my brake shoe anchor pin "locking flat washer installed. 4th is a Heavy Duty frt wheel cylinder.

***********What do you all think***************

Standard Brakes or Heavy Duty Brakes? I say Standard Brakes