D60 questions

I ran across a guy that has a rear D60 from a 91 Dodge with a Cummins diesel. All I know is that it is an 8 bold and has drums. He wants $200. Does anybody know the WMS numbers or any info on this. I will be doing some searching, but my internet is only staying up about 3 minutes at a stretch tonight.

get a pic of the tags that are bolted to the cover and at the webbing on the outside of the housing it could be a 60 70 or an 80

Is it a SRW or DRW?