Everything looks great except there's a document enclosed that says:
It is important that you read the below caution information, very important!
Severe engine damage can result from simple mistakes.
Subaru has two different Timing Belts on the original engines during the years 2000 and later using the B304 (13028-AA181) and the B307 (13028-AA21B) part numbers. They are both the same length and width and appear identical but, they actually do not have the same tooth design. This tooth design difference is not easily recognized. It is very important, as usual on all applications, to fit the Timing Belt to the Cam Sprocket teeth (wrap it all the way around) and look very close at the fit. Use a light source behind the fit to help with this inspection process. It is the responsibility of the installer to install the correct part. The Timing Belt should fit perfectly. If you have any doubt, check the other part number fit. You will be able to see the obvious difference while they are very similar.
This is NOT cool! So it sounds like there's no way of knowing untill I have the whole thing torn apart. If I have the wrong belt I'm SOL!
According to the contents list on the box it's a 223 tooth belt.
This is for a 2000 OBW non-LTD