We have for sale a lot of 4 metal poles that used to hold glass insulators.  All 4 are similarly designed.  The thing you'll love is that the original square nuts are on the bottom each and they spin freely - not rusted in place!!  All 4 have the original square "washer" present too.  Threads might need to be filed down a little to reshape them but it's hard to find a set of 4 that are in this good shape!