[Ben M.]

Originally Posted by hurryinhoosier62

OE rotors and calipers are still available through RockAuto(Raybestos parts).

The parts stores all list rotors available, but if you check the part number they give you it's a 4.75 on 5 bolt pattern and not correct for these cars. No one is making the original rotors that fit these cars to my knowledge.

Best thing you can hope for is finding a late '68-70 B body with disc brakes in good shape that is getting parted or junked.

[hurryinhoosier62]

Originally Posted by Ben M.

The parts stores all list rotors available, but if you check the part number they give you it's a 4.75 on 5 bolt pattern and not correct for these cars. No one is making the original rotors that fit these cars to my knowledge.

Best thing you can hope for is finding a late '68-70 B body with disc brakes in good shape that is getting parted or junked.

Every source I’ve looked up lists two different wheel lug bolt patterns for ‘67-‘70 “B” bodies: 5 X 5 (like my ‘64 Catalina) and 5 X 120.7mm(5 X 4.75). One more case of measuring before buying.

[Ben M.]

Originally Posted by hurryinhoosier62

Every source I’ve looked up lists two different wheel lug bolt patterns for ‘67-‘70 “B” bodies: 5 X 5 (like my ‘64 Catalina) and 5 X 120.7mm(5 X 4.75).

While I'm sure you are correct that the sources say that, I have never seen a 1967-1976 B-body with anything other than 5 on 5 bolt pattern. The application listing in many cases lists the wagon version as the 4.75 on 5, which I know should be wrong having owned a half dozen over the years. I did this conversion myself 15 years ago and back then the 4.75 on 5 was NOT listed as a viable source by any of the old books or computers. The bearing sizes between the two are not interchangeable to fit the smaller bolt pattern rotor on the spindle of a big car (I tried both a '70-81 F-body and a '71 A-body).

In 1977+ I know the 4.75" on 5 bolt pattern was the standard and only heavy duty suspension cars got 5" on 5, making finding brakes for them an exercise in fun.

[hurryinhoosier62]

Originally Posted by Ben M.

While I'm sure you are correct that the sources say that, I have never seen a 1967-1976 B-body with anything other than 5 on 5 bolt pattern. The application listing in many cases lists the wagon version as the 4.75 on 5, which I know should be wrong having owned a half dozen over the years. I did this conversion myself 15 years ago and back then the 4.75 on 5 was NOT listed as a viable source by any of the old books or computers. The bearing sizes between the two are not interchangeable to fit the smaller bolt pattern rotor on the spindle of a big car (I tried both a '70-81 F-body and a '71 A-body).

In 1977+ I know the 4.75" on 5 bolt pattern was the standard and only heavy duty suspension cars got 5" on 5, making finding brakes for them an exercise in fun.

I had a conversation with Nunzi maybe 15 years ago before disc brake conversion kits became available for the ‘61-‘64 “B” bodies. If I remember correctly Nunz said that to convert a ‘64 to disc brakes you had to use a ‘70 “B” disc brake setup. because it used the 5 X 5 (5 X 127mm these days) bolt pattern. I do remember he was VERY specific about the donor being a ‘70.