Check out Dunlop Direzza Zii's. They have a 235/40/18 and the 275/35/19 available. I run the Zii's on my 69 Camaro due to choices for rear tires in a 19" diameter. Up front I have run the Zii in a 255/35/18 and now have 275/35/18. I've been very pleased with the wear and ride. I would like to give the RS3's a try next. They too have the 235/40/18 and 275/35/19 sizes which might work for you.
The other option is the Nitto NT555. It is a high performance street tire at 300TW available in the same sizes as mentioned in this post and a 225/40/18. Check tire dimensions and suggested rim widths. The lower aspect ratios do suggest a wider width so the 7" may be a tough one to find tires for as you are finding out.
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Jay
1973 Trans Am "KLRBRD"
1969 Camaro SOLD
2014 Stingray Z51 SOLD
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