the block for the brakes you seek in the same for disc/drum and drum/ drum.
Sorry, this is incorrect information. The 2 blocks are different and very different in price.
This is a drum brake block, with 2 holes in the bottom, 2 in the side, 1 line to each wheel.
this is the disc brake one, 2 holes on the side, to each rear wheel, and one on the bottom, going to the proportioning valve. Since it unique to disc brakes, and the factory disc brake cars (GT's Shelbys, Most K codes, etc. ) , normally, are much more expensive, this drives the price of this part to be much more expensive.