If the dozer is not used in heavy production, sprocket liners could be a useful way to go. We used them by the ton in Florida years ago as the corral sand there ate sprockets for breakfast. Our shop had one guy that did nothing but weld liners on all day long five days a week. 25c is correct however, that the rest of your U/C should be in good condition.
First make sure that you have enough of a sprocket pocket left to weld a liner in to. Then use some 7018 rod and weld in solid. You could use some 11018, but is a little over kill and is a little more expensive. Do not use hardface. Make sure that you allign the new parts well. Also, if you do this on the tractor, don't be in a big rush to get the job done. You don't want to overheat the seals in the final much.
Just a point of interest. Some late model Eimco's used Caterpillar U/C parts. You could maybe buy a couple of new sprockets from Cat, even have Cat install them. Save you from having to bum the tooling and a lot of work. If you are not sure what sprockets you have, talk with a Cat parts & service rep and ask if he could come and take a look. He might be delighted to see an old tractor that was still in running condition.
Another thought, if your worn sprockets are Cat, your local dealer might be able to find a couple of decent used ones from a scrapped out tractor. They should be way cheaper than new. Just an idea.