Street Twin Low Seat

Went to check on progress on my new Street Twin. As part of my £900 free accessories I opted for the 'Low Seat' coz I'm a short arse. Triumph claim the Low Seat is 20mm lower - IT ISN'T! I swapped between low and standard a couple of times and I honestly cannot tell the difference putting the 2 seats side by side there appears very little difference, a few mm max and it's ribbed instead of flat. I'm very disappointed that Triumph want well over £200 for a seat that doesn't deliver. So instead of the Low Seat I'm having the Bar End Mirrors which leaves me £9 to spend out of the £900. Hmm what should I put it towards?

JB