The Scott part you want is on the right. A large aluminum rivet with a split washer. The one on the left is a large threaded rivet I used to swap out broken Nordica Polaris parts. I found them at Snowcovers in Vancouver a few years ago. They have changed hands and are called Skiis and Biikes now I think. I should think any good shop with a good bootfitting department would have a good selection of boot rivets that might work. Otherwise get yourself a decrepit pair of Scotts off ebay for parts.