NHT markets an amp that looks & has specs that are very similar to the 200, it’s called the A-1, and they sell rack mount ears, called E-1, for it. Follow this URL http://www.spearitsound.com/ and look for “NHT Evolution Specials” then “Evolution options” at the bottom.

I’d ask about the dimensions but I’ll bet they are identical. Paint color might be a problem.