front frame rails needed

Hey guys I see several of you have frame rails out there. My Swinger has a cheesy looking driver side rail. I was going to go with the cap but I am not sure if that will do the trick or if they are any good.(chime in on that one if anyone has experience) Reality is I will not be able to do the welding myself but do know people who weld and an actual teacher so that is not a problem.I guess I need to determine if I need the rail or if a cap will do. what is the criteria?(besides cost)
What kind of money would you be looking for? ,ball park, for the passenger side rail. I suppose getting the whole thing would be best then use what I need?
Please PM me with the bucks you would be looking for. I can get it shipped to Washington State, only 45 minutes away.
Much appreciated.