stick with the RCM, its obvious they copy mikes trays, those look thin, prolly dont have mudguard clearance, and dont have a choice on sizes, get the real deal......
Got answer for my question, that what are dimensions, and this is what they told me:
"it around 155 x 55 mm inside/ 156 x 56 out side."
Well, i started to make my own, its "sandwich" desing. Its going to be perfect size for me.