Hi
The 185VR15 Pirelli Cinturato CA67 is the best tyre for:
Series 1 E-Type
Series 2 E-type
MK1 Saloon
MK2 Saloon
S-Type
it is worth mentioning that when Jaguar did all the testing with Norman Dewis for the XJ6 and moved on to fitting 205/70VR15 tyres, they also did the testing for the mk 6 cylinder E-type and stuck with 185VR15 tyres. I have spoke to Norman Dewis about this in person, and he said it handled better on 185VR15. they loved the Pirelli Cinturato in testing, but stuck with Dunl;op because of its locality and price and Dunlops relationship with jaguar.
they didn't fit 205/70VR15 on the E-type untill they fitted the power steering and the V12 engine. It was not just the weight of the steering that was the problem it was the handling too.
Also fitting proper branded tyres like the Pirelli Cinturato and Michelin XVS also look so much better than modern tyres like the Vredestein as well as handling better.
https://www.pirelli.com/tyres/en-ww/car/collection/product/cinturato-ca-67https://www.longstonetyres.co.uk/media/wysiwyg/longstone/english-website/jaguar/e-type/e-type-jaguar-period-advert.webp
Pirelli also make the P5 for the XJ series and Sweries 3 E-Type
https://www.pirelli.com/tyres/en-ww/car/collection/product/cinturato-p5In Germany these are available through Munchner Oldtimer Reifen.