I have a Triton 1650SC, the front deck thickness is .100"
Standard rivet nuts should work just fine, I would definitely use 1/4 x 20, along with stainless bolts.
Also, be sure to apply some never-sieze to the threads before installing, otherwise the dissimilar metals being in contact with each other, particularly in moisture... will literally weld the bolt into the threads of the rivet nut.