I'm in the process of timing belt/water pump/head gasket job.

I believe I have a gates belt purchased as well... it came from a place where I use to order a lot of parts for my german cars. (bmaparts.com)... Be sure you replace those rollers for sure. When I pulled the right timing belt cover, the bearings from the roller on the right spewed out all over the driveway (not sure of the brand, but I'll see if I can find it.

You may also find that the timing belt cover gasket is bad... mine was flaking away was quite dry and brittle. I ordered replacements, but I may have to trim down some of the replacement to fit. The gasket for each cover is like in 4 pieces. I could only order a few of the pieces, so I ordered extra quantities of the longer pieces so I can trim them down as necessary.