I've got some pics of Dave's bike with that rack right here:
Pic 1
Pic 2
Pic 3
Dave's rack has a lot more capacity than the Triumph racks, which are really quite small. My Tbird beside his has the stock rack, and the T-bag on the back nearly overwhelms it.
Another option would be to talk with Sprint Manufacturing in England, which specializes in aftermarket Triumph accessories. They have some nice racks, and some of them accept hard luggage.