Hi Paul,

I have a 2004 Javelin 16 and can tell you, that the mast is not a pure A-cat mast. Maybe the length and outer section is the same, but the spreaders are simplified (not adjustable) and there seems to be some reinforcement to the mast section to sustain the weight of two sailors. At least you have the advantage to use A-cat sails. Oxo sails offers two sails for the boat (called F16 sails on the Oxox web page). One with abou 15m² and one in A-cat size or close to it, the stock main sail is a Petrucci pentex sail, at least on my boat.
I think that the only parts which are taken form the Bimare AJ A-cat are the beams, daggerboards and rudders.

As somebody else wrote some days or weeks ago, you may get a positive answer, if you ask Bimare for a 8.5m mast.

Cheers,

Klaus