Hello everyone, I'm in Alabama and can't wait to start taking my pop-up out. I got my hands on a 1978 Starcraft pop-up camper, it needs new bed rails and it'll be in great condition. I've looked around and finding parts is awful. does anyone know if the rails that slides the bed in and out are universal, or are they specific to each model? They seem rather simple to replace I just need an after market set or see if a pair from 1975 will work with them.