What type screws do I need to install my GE profile spacemaker oven?

What screws? All necessary screws should be in hardware package with microwave.

See installation instructions.
http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-40538.pdf

The long screws that hold the MW to the cabinet? Instructions will tell you the size. If made in China, probably metric.

Any screws that will hold in the oven will work. They should have come with oven.