Monoposto Racing F3

[matt-1g2m3]

Hello PH'ers

I'm looking to start circuit racing after finally doing a few sprints over the years.

I have a 1985 Ralt RT30 F3. My issue at the moment is that I'm looking for what tyres to use for the series, because I have been sprinting I only have Avons super soft compound.
Currently my tyre sizes are
Front - 180/550R13
Rear - 250/570R13

What do most Mono guys use? I'm thinking I could probably use the F3 cup tyres which I believe are
Front - 200/540R13
Rear - 250/575R13

I'm just testing the water within circuit racing at the moment and I dont want to buy brand new tyres just to get me started I'd like some used ones.
Can anyone point me in the right direction on where to look or get tyres suitable?

[matt-1g2m3]

Thanks for the replies guys.

Well I'm based in Nottingham right now.
I wanted to maybe compete in the Oulton park event end of this month but if I can't find tyres i'll have to wait for the donington park one