Ken,
Verify this with Prevost because they may have changed axles or hub or I may be off in my numbers. They are usually good about giving cross reference numbers to theirs on generic parts.
Front and tag axles seals: Prevost 610754, Chicago Rawhide 40086
Drive axle seal: Prevost No. unknown, Chicago Rawhide 48690
You will also need the gaskets for the outside end of the hub unless you intend to use "form-a-gasket" or something like that. (I don't, I use new gaskets with gasket seal.)
Regardless of who replaces the seals it is imperative that the seal is installed without deforming the sheet metal outer housing. The seal actually rotates within that housing and if it is pinched or binding you will replace that seal very soon. Watch that like a hawk. It is also vital that the hub gets filled with lube after everthing is assembled and before you restore the axle. You can nurse lube in there slowly (because it takes time to get past the bearing), you can tip the axle (far side as high as it will go and replacement side as low as it will go), but regardless make sure the differential is filled to the bottom of the hole with a level differential.
