WTB wide 15" 4std rims or other alternatives

hi all,
my baja has come to a halt.
is a 69 with 4 stud wheels and disc brake front.
it came with 14" x 6" sunraysias all round, but the backs are far too skinny for the car,
so i went to change to 5 stud pattern to run my old wide 5 sunraysias.
brought the 4 to 5 stud plate for the front discs (for off road use only)
and am trying to find rear drums with 5 stud that are wide enough for the 4 stud brake shoes.

so just to get the thing on the road im after two 15" wide 4 stud rims, either sunraysias or standard.

or

two rear drums that will accept the wide brake shoes

or

some other alternative.

have heaps of wide 5 stud rims to swap or whatever, 13", 14" 15" and too many other dub parts
prefer SA but hey im gettin desperate