[kdog26372]

Ok, so bought the JL Audio C2-400x coaxes to replace the rear HK's. ~$95 shipped for the pair. Then bought BMW harness on Ebay for $20 for 2. Maybe they were once $10/pair, but appear to be $10 each now.
Stuff should be installed next weekend and hoping for positive results. This is only forum I've found that someone actually tried and was impressed with replacing rears; most seem to feel they aren't worth changing in HK system. We'll soon find out and I'll let all know what I think. For $115 all in it's worth the risk to me and I can easily get most of that back by selling on Ebay if I don't like them.