Unless the TT shop can assure me that they can get the DTM lower valance section to fit "out of the box" I may well opt out and spend it on something else 
....Obviously I'll let TTshop themselves say what they can or can't do, but as your whole holly valance is one-piece (Ed30) the only way (I think) would be to buy a R32 Spoiler part to go with the OSIR CF. But then, as discussed in the other thread, you've got a camera to accommodate. As I understand it from Justin, the OSIR tail pipe trim comes with screw fixings.
I'll be interested in hearing if anything can be done.