My 73 needs new wiper blades. I have them off the truck right now and today I removed the worn out inserts. I also notices that the rest of the assembly can not be taken apart as it is crimped and pinned together unlike more modern wiper units. Right now all I'm seeing in the way of replacements are what I consider some very expensive inserts, yes I can afford them but they seem like rip off prices. I may go all new parts if I'm going to pay that much. What are my options with this? Any cheaper inserts I'm not finding?