Hi sonny, and welcome to the site.
All you need to do is unscrew the central mounting bolt for the touring seat and replace it with the 2 bolts that fit the saddle & pillion pad to the bike.
Be aware that the front bolt isn't a regular one - it has a built in spacer that's required if you want to use the pillion pad. Brent at
www.newspeedmaster.com sells pretty chrome ones, or I'm sure you can get the standard galvanised one from a triumph dealer.
You might find someone on here who'd be willing to swap seats with you - try putting an ad in the classifieds section.
Matt