I have Yokohama A-539 summer tires that I mounted in 2015 (second set I've used). I bought them from Demontweeks UK, and they were not listed on their website. I contacted them and they had them for a spec race series they use them for.
They perform quite well in my opinion - the handling & braking is great. No one in North America sells them though
- you will have to import them.
When I'm due for another set, I'll contact them again -and/or I'll try these - and yes, they're available in 185/60/13!
- yes, they will be expensive... however, it's the easiest "bolt on" performance modification you can make to these cars that help in braking, handling & looking awesome! Kinda where you need to start in my opinion. When I bought my car in 1989, it came with Pirelli P6 in 185/60/13 - I then put Yokohama A509 which I loved - then two sets of A539.
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The new YOKOHAMA Tyres for Classic Cars.
www.yokohama.co.uk