Naming of R3 seats is a pitfall for newcomers and oldcomers alike.
Before the 2008 R3 Touring (R3T) model with different frame, wheels and single headlight many Triumph accessory seats for the 2 headlight 2004-2018 Std/Classic/Roadster range had 'Touring' in their product names. After the single headlight model came out these names continued in use for some accessories.
R3T seats will not fit the 2004-2018 Std/Classic/Roadster range or vice versa.
There are about 8 different Triumph seats for the 2004-2018 Std/Classic/Roadster range.
Generally taller riders need a taller seat but with ability to lean back. Really tall folks can happily use aftermarket Fwd controls if they are happy to be without crash bars. Rider's backrest are a real boon for comfort and can make a reasonable seat much better.
Best Factory R3R Dual seat is the Classic Dual with hole for rider's backrest. The backrest has not been available from dealers for many years.
CLASSIC TOURING SEAT - DUAL A9708164
For use with Adjustable Rider Backrest A9708160
I have a brand new old stock set of the seat and backrest in the USA awaiting bundling in a shipment.
These though are not the best seat /combo
for taller riders on later R3 Roadsters with mid pegs as they were designed for the fwd pegs of the 2004-2009 R3 Std/Classic and tend to push the rider fwd in relation to tank and pegs.
Best /cheapest option for you is to firstly get a rider's backrest to improve your stock riders seat hugely.
Utopia in USA make a rider's backrest option for Dual and Solo R3 seats.
The rider's seat pictured is a Solo Gel but is identical in shape etc to your stock 2014 Roadster Solo with a stock 2004-2009 'Bread loaf' pillion on rear.
I have a used Utopia here in my shed.
Then if you want to go ahead get a second hand rider's Solo seat and have it re-upholstered at a specialist motorcycle seat re-builder.
I think
@adelaideVMC may want to sell his Utopia backrest and separate Triumph Gel Rider's Solo and Gel wide Pillion seats.