Yeah, I'd go dumpster diving for those!

I have my original set like those from my Jet jointer. They work "ok" as long as I keep the rubber surface clean, but I really like the idea of the push stops on your new ones.
I'd probably make new bases with that feature for your old ones, but the price for your Micro's it tempting!
I really like the fancy push block "system" they make, but find it a bit fiddly to switch over to a new task.