Depending on the year it was either a Seldon Isomat or Z Spar (US). I believe it is a keynon Isomat mast as there is a reference. Kenyon Isomat was purchased by Z spar who flubbed up and that was the end of those two companies. Charleston spar then replaced Kenyon Isomat and I forget what it is called now. Not sure if there is a reference back to your mast but if you look, there is a company mentioned who is supplying parts for the old Kenyon Isomat and if you can find out or someone here can send you in the right direction, that company might be able to help. Sorry I cannot help any further.
