That’s a tremendously good question- and the answer is currently no. We don’t even sell the Coupé-sized bolt packs separately. I’ll have to ask if we can get those listed on the store.
If you have some decent cutters, the Nylon bolts are really easy to cut to length though, and you can get a long set here: http://shop.pimoroni.com/products/pibow-extender-bolt-pack