I was finally able to get the 2 player version for Sunset Riders for US version - ssrdrubc.zip. There is a version of this named: ssridersubc.zip is incorrect. The versions I was trying to setup had the correct files in them, but it was renamed incorrectly ssrdrubc.zip = ssrdrubc.zip + ssriders.zip. In newer versions of mame they changed some of the name spaces for some roms. I had not noticed this for some games like Turtles in Time 2 player version as well: tmnt22p.zip = tmnt2.zip + tmnt22pu.zip. So both Sunset Riders 2 player and Turtles in Time 2 Player both US versions work perfectly fine using mame2003
Sunset Riders 2 Player version
ssrdrubc.zip = ssrdrubc.zip + ssriders.zip
Teenage Mutant Ninja Turtles IV: Turtles in Time 2 Player version
tmnt22p.zip = tmnt2.zip + tmnt22pu.zip