I recently changed out my worn chain and rear cassette on my year 2000 Trek 7000 mountain bike. I am find that I still have drive train issues, my 32 tooth (center) chain ring needs replacement also, as I am getting chain skipping only on this chain ring. I am looking around for replacements and having a bit of trouble identifying exactly what I have. An online Trek manual for the bike identifies the cranks/chain rings as Icon Onyx, 4 arm 44/32/22. My chain ring appears to be 104mm BCD.

My question is this. I can find lots of chain rings, but some of them have the following statement or something similar -
•ChainRings: from Shimano HollowtechII & Octalink MTB cranksets have different length tabs & are not interchangable
My crank set is neither, but I don't know which of these my Onyx cranks are compatible with. Can someone provide some insight on this? I tried searching the shimamo website but could not ever pull up any documents, and they are not accepting email.

I pulled the chain rings off today, and the middle one is marked with Shimano M9 N-32, then opposite this marking is "EB". The large chain ring is similarly marked Shimano M9 N-44, and not too far away is "AE". The smallest chain ring is marked with just "22". The crank is marked with AOB21L 175

I know I have previously replaced at least the outside and middle chain ring previously. The inner one looks pretty clean, so I suspect it is a replacement also.