1994 2500 4wd front speed sensors where can I get the right and left sensors

[ecodiesel 2015]

I have a 1994 Dodge 2500 4wd cummins and am having abs warning light coming on. I replaced the speed sensor in the rear diff already. I am having a really difficult time trying to find replacements for the front axle. Has anyone found a supplier that has the speed sensors for a 1994? These are the originals sensor and I think the many miles have done them in.

Thanks!!!