The Rocket III Touring has a different fork design to the Roadster, hence the ability to upgrade not just the springs but by adding the Gold emulators further improves the damping and rebound characteristics.
I haven't checked prices lately but pretty sure nobody will be as cheap as mine, especially for an Aussie buyer. I have an 11" inch pair of Gazi on my other Roadster I don't need but they have Orange powdercoated springs.
I still have quite a few new and used Triumph Rocket III Touring accessories including luggage, leather and footboards etc to sell before I move North in the next few months.
Brand new Race Tech Gold Valve Cartridge Fork Emulator My price Au$200 (US$130) + postage.
(new retail Au$380 (US$220 = tax /freight)
BRAND NEW FORK SPRING KIT - MY PRICE AU$140 + POSTAGE. (NOT REALLY WORTH POSTING TO USA UNLESS BUYING THE LOT)
(new retail Au$240 delivered (US$112 = tax /freight)