exact swap.
cost new is about $1k (hahahah!!!)
once upon a time, i picked up an ST4S-spec ohlins shock, swingarm + hugger for about $650 off eBay.
sold the swingarm for $500 and the hugger for $100 and wound up with a brand spankin new $50 ohlins rear

incidentally, if you find a stock unit off an m1000 or monster s4 (non-R), it's the same aluminum unit you're looking for.