international 500 e or c? need help

Yes, the 500E had power steering and the 500C manual. I'm not really a 500C expert so I may be off a little here, but I do have a 500E that just underwent a two year restoration. That's a story in itself. The engine/transmission is basically the same in both, as is the frame with the exception of the crossbeam that connects the main frame to the trackframes. The 500C used a round bar whereas the 500E used a rectangular bar. The biggest difference is in the final drives. The drive sprocket on the 500E is flat, the 500C cone-shaped. The final drives seem to be a weak link, and while the internal gears and bearings can be found, the housings themselves are next to impossible to find. The 500E's seem to be harder to find than the 500C's. I searched the country for a housing for mine, and found two. I paid twice as much for the housing as I did for the dozer.
Here's a rainy-day picture of the 500E right after it was finished. Hope this helps.