If anybody is interested, I just got off the phone with Steve from Kehler skis in BC.
He informed me that Kehler does have an STC for the 172 skis but not the 150 set, and a pair would have to be field approved for use. All documentation was available.
Also, a new set of skis for a 150 is priced at $6000 currently, 1/1/2014.
Also, a Kehler set would work with a 150 that has a heavy duty nose fork. (like mine)