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As Brian said, it's easy enough to make your own insert blank inserts. When you need to use a dado blade just pop in a new blank and cut a ZCI dado insert for the size of dado you will be cutting. Pretty soon you'll have a set of ZCI dado inserts for all the popular sized dado's you frequently cut. If you use different blades when doing your woodworking, i.e. rip blade, crosscut blade, general purpose blade, it's a good idea to have a ZCI specifically for each blade.
~~Don't worry about old age; it doesn't last that long.
I added a pair of cast iron extensions to replace the steel extensions on my R4512. They were from King Canada. I am not sure how popular they are in the US, but you should try the small local tool shops that deal with the major and non major manufacturers. They should be able to get you prices on what would be replacement parts for larger saws that come with CI extensions as standard.