Yes, you can use the pin off your stock Triumph seat and install it on the Corbin. Corbin mounting system is crap. Did mine about 2 weeks ago, never mounted it with the Corbin stuff. Just drill out the brads that hold the pin on the stock seat, then just put the pin in the latch on the bike ( you'll see it only fits one way). Now you are looking at the top of the pin that will connect to your seat. I broke off the top of a Q tip and put them in the mounting holes of the pin. Then I put fingernail polish on the Qtip ends to mark where to drill on the seat. Put the Corbin seat on the bike and sit on it. Then take the seat off and you'll see that the fingernail polish has marked the bottom of the seat to drill your holes. Be sure and take the mounting hardware off the Corbin seat before you do this.(just two chrome brackets) Mount the pin to the Corbin and your done.