Thanks Paddles, I've actually managed to get a second hand 4.5 & 5.4 pretty cheaply that the last owner used on a 430.

I think they're a couple of years younger & different brands than my mast, around 2008 vs 2010/2011, but there's always a bit of guessing with 2nd hand.

Thought I'd just check, can they just go on any 430?
Would it damage the sails or the mast? I would guess the mast would be ok, but sintered it's in such perfect condition I plan on keeping it for a long time, so would rather make sure.