Hello! I have been playing a 913D2 for a while now, and I would like to upgrade the shaft from the Aldila RIP 60 to a premium shaft option. Looking at the Titleist 2014 custom club catalog I see that the Fujikura Speeder 569 and 757 are options, but the 661 is not??? For my swingspeed,desired ballflight, and relative strength the 661 is exactly what I want/need. So, I suppose what I'm asking would be is the 661 available as an "off menu" option?