Is there an easy way to repair the backseat back that anyone knows of, or is it one of those things that has to be taken to an interior shop? Thanks in advance, I've found some great help here.

I would imagine that it depends on the nature of the repair. I've seen some owners re-stitch busted seams in the material or re-stretch the cover by getting new hog rings and pulling the covers. Depending on the size, tears and rips in vinyl MB-Tex can be glued, but usually its better, in the long run to get a new cover.

Any suggestions on where to get such covers?

http://www.galaxymall.com/auto/mercedes/

I've used these folks. Found them honest and a good product. FWIW

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

for the help, there are some great people on here.