Wanted: 1" crown race

Howdy, as the title suggests, I'm after a 1" crown race for some new forks I bought.
It's for a fairly standard looking headset. Not sure of the brand though.

ISO or JIS?

Not sure. How can I tell?
The frame is a 1990s Raleigh road frame, with i think a 1+1/8th inch headset. And the forks are alloy and I think they're 1inch ones.
I only say I think so cos I'm at work, and the bike's at home.

Ok, so the original forks have a diameter at the base where the race sits, which is aprox 25mm, but the new forks I want to replace them with have a diameter of 24mm. My measurements may be slightly out, but that 1mm is significant enough that the crown race is loose enough to spin freely.
I've scoured google, and can't find anything referring to a crown race that small.
Can anyone shed any light on this?

You need to measure accurately, you won't find 24 or 25mm crown races.
Are you trying to replace 1/1/8th forks with 1" forks?
Have a read here
http://www.sheldonbrown.com/headsets.html

Hi.

Rather than start a new thread...

I'm after a crown race for 1" threaded headset. I need to get something that'll work ok on a Campag Record headset like below. They're ISO in size. I've tried Nigel at Campagoldy, Mercian Cycles (who import Campag spares). Anyone any ideas?

You need to measure accurately, you won't find 24 or 25mm crown races.
Are you trying to replace 1/1/8th forks with 1" forks?
Have a read here
http://www.sheldonbrown.com/headsets.html

I may be trying to replace 1. 1/8th inch forks with 1 inch.
But i'd have to be well out in my measurements. It can only be a mm or 2 of difference at the most. I think I'll have to take the forks to the lbs and see what they've got that'll fit.
Thanks for the advice.

How 'standard' are fork crown races?

Is it likely I'll be ok using a (for example) Tange headset race with a Campagnolo headset?