I did this to my parts truck rear axle before I bought #2 that actually ran.
I got some 14 bolt backing plates at a pull and save. Took the plates and one of the d70 rear baking plates to a machinest and told him to make the holes to match out. I know of some people who just honed it out with either a sanding wheel or augered it out. Since it was a pretty serious part, I opted to have it machined. I cost me about $50 to get it done, and it fit really well. If I did it again, I would also have the machinest match the four mounting bolt holes as well. I did have to auger it out with some drill bits. I broke a few getting that done. I think the shoes were 2.5" wide instead of the stock 3.0- I remember it was pretty close. And all replacement parts are over the counter with a non driveshaft e brake. Make sure to pull the e brake cable if you find one at the pull and save. Usually they're cut off.
Over all it was a pretty easy and slick retro. I knew before that I was going to get rid of the np200, so i was pretty motivated to find an e brake system that didn't require me swaping the axles out- gonz
Come and take it
Go work at joann fabrics if you can't shoot a gun