If a 10x2.5” drum brake kit will work you have a standard BBP offset axle. All Mopar BBP axles have the same offset, so you can literally use drum brakes from any RWD Mopar up to about 1991 with axles that have the 5x4.5” pattern. A/B/C/F/M/J/R bodies and even some of the lighter duty vans and trucks. The majority of them will be 10x2.5”, but there are also 11x2”, 11x2.5” and 11x3” drums out there.