thanks guys
will need to look into this more.

Just pulled out my 1969 master dealer part listing book, last updates jan, 1971.

Shows 11x3 for dodge and Plymouth with heavy duty pkg? Also list belvedere and cornet with 11x3 front and rear with police pkg.

When I measured them today drums are 3" and shoes showed 2 7/8 wide. In book it shows a 2 3/4 rear shoe.