[80SPORT]

The hollander manual lists BK,BM,CK,XAJ as 15 x 8 truck wheels...all direct interchange.

My Chevy OEM parts book for 79 to 82 lists BM,BK andCK as 15x8 C10 wheel codes.

I suspect the XAJ code is for the newer wheel in the 73-87/91 series.

There are a lot of wheels out there so it is always a good idea to test fit on your truck before painting/powder coating/mounting tires.