Good luck. No longer made (for several years now) and finding a set would be like finding an honest politician.
I realize you're excited about your new purchase and I have personally always had a soft spot for 12R's, but the machine hasn't been made for 14 years. Get in touch with active forum members like olajoe who own 12R's and maybe they can help with resources.
It may be a pig, but it's a pig with a rocket in it's ass!