Hello Doc
Which armrests are you looking for? I assume if you need 4 you are looking for the units that are on mounted to the cabin below the windows? I bought one for my 5th seat from Don Nieser couple years ago. There is also someone on e bay that is paring out a Skymaster, all kinds of goodies there. Here is Don's info:
Commodore Aerospace Corp.
6221 Commodore Lane OKC, OK 73162-6814
Phone: 405.722.4079 Cell: 405.503.4686
nieser.02.337parts@juno.com