Do yourself a favor
Naruto,
I'm guessing you'll probably be ok, but why bother and why take chances? Rivets are cheap and readily available. Maintain a well organized assortment of all common types and sizes (including half sizes) at your workshop, and it'll make your project go a lot smoother. You'll know immediately what you don't have (seeing an empty bin), and then you can order from Van's, Spruce, or any of a number of sources.
One of the best pieces of advice I was given at the start of my project was to first take all those little baggies from the kit and sort the hardware into bins or some kind of organizer. Packing the hardware into baggies make it easier for Van's, not for you. Sorting them is a PITA, but you only have to do it once.
Good luck,