Presumably Fung is the "guy in California" ColsPaul mentioned.
http://funggrip.jnb.com/ Here's a set on my 41:
I've been extremely pleased with them. The fit and finish is exceptional. I did have a problem with a frame pin falling out. The stock grips covered it but the Fungs left it exposed and allowed it to work its way out on occasion. I staked it with a punch and have had no more trouble with it.