Diesel Laptops has built a free, open platform that allows you to cross reference aftermarket and OEM truck parts. While it does contain some automotive and off-highway parts, the majority is focused on commercial trucks. Give it a try and let us know what you think!
Website: https://truckpartscross.com/
Apple iTunes: https://apps.apple.com/us/app/truckpartscross/id1372622264
Google Play: https://play.google.com/store/apps/details?id=com.tpc.truckpartscross
If you visit the website, you can also find a desktop version as well.