When it comes to parts, OEM replacement parts are not your only option. Aftermarket parts are designed specifically for your machine, they are NOT “universal” and in no way are less quality. In most cases you will find that Aftermarket parts have been designed to work better than OEM parts for the service industry because aftermarket manufacturers take into account the wear and tear on you machine.
When a new engine or piece of equipment is manufacturers all parts are NEW and after replacing a few parts the ones they attach to are, well used and have wear to them. Aftermarket manufacturers recognize this and design their parts to work on equipment that has run time on it and man not be in “new” condition.
Aftermarket parts are not available for every machine and every option, in general they are manufacturer for machines that have large production runs as many parts are need to keep costs done and there for aftermarket parts may not be available for your machine.
Aftermarket manufacturers offer a warranty on their parts that is second to none so you can rest assured that the use of aftermarket parts in a service application will not void your warranty in most cases.