My Hollander book says the 5458523 was for a 1967 Firebird with drum brakes. It makes no distinction between power or manual. Only between drum and disc. Looking around at the available replacements all I see with the bleeders is the disc brake models. On the drum MC the boss is there, but not drilled for the bleeders. I do miss those, bench bleed on the car, priceless! We had a 1968 Buick LaSabre with power drums. If you weren't careful it was easy to put your head though the windshield.
