Have you a pic of your old wheel type? The Classic models I've seen with gen Zodiac transom wheels have had the stronger type of the two Zodiac offer with the larger tyres. Often the Fastrollers are fitted with the smaller set.... as mine was.
Having said that I've fitted most types of wheels to most types of SIB and as long as you keep all the fittings from the old set you'll get them on neatly.
No that's right, you'd have to buy a set of lugs. You need to hold the wheels against the FR transom to see if you were lucky enough to have the bolts at the top go through the existing holes that are there from new on a FR ... and that the lugs will be able to be fitted so that the nuts inside don't rub on the back of the air floor in any way that might damage it.
Here are the smaller Zodiac wheels I fitted to my FR. They have a different lug to the heavy wheels which sits much higher up the transom and is well clear of the air floor.
They are totally sufficient for the lightweight FR with a 15hp fitted.
