Our OnlineMarineStore.com does have the 4:1 Harken Sheeting System in stock. It is a kit consisting of:
Yes the components are in stock
HHSB411 list 93.85
H2657 list 85.35
H281 list 1.20
For the Wave, we are going to list it as a Sheeting System with 40' of 1/4" or 5/16" Salsa.
Check out the attachment.

Dave has been swamped and has yet to get this online, but hopefully it will be soon.
I plan on getting the system for my Wave to try it out.
Rick