They get beat.The flanges get thin and pitted where the idler castings need to have a nice fit. Make new ones is the best bet.Then the idlers will line up correctly and make the whole restoration look more professional. This is one of the areas I look at on a restored tractor that gets overlooked. I've made several for Fifteens Twenty-Two's and Tens.
The flanges look to be in pretty good condition. I don't see that they are anymore worn up front where the idlers mount then anywhere else on the rails. But I'm concerned about the outside rails both being bent toward the the inside. Has anybody else seen this on their pv15?