The piece you are looking to replace is called a bridge. The individual pieces that the strings ride on are called saddles.
You may not find a direct drop-in replacement for it but if you measure the string spacing (by measuring center of string to center of string) and overall width of all strings, there are several places that you can find a black bridge that may or may not require drilling.
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I've used the first two several times, GPR once or twice, etc etc a few times. I've bought bridge pieces on eBay before, but they were Chinese pieces o crap going on a piece o crap bass.
Good luck. By the time you're done modding the Mikro, it may be a pretty cool bass!
Edit: And please, stop referring to yourself as the old guy. I'm the only one allowed to feel old and crappy.