Largest wheels for a CMC?

The car is built on a 69 pan and same year transaxle. Any ideas on if what wheels will fit. The wider the better. I asked this question a year ago on the site and a guy with a very clean CMC from I think Georgia or maybe Kentucky had some 5 1/2's he fit under his speedster. He gave me his phone number to explain how he fit them under the car. Long story short, I lost his number. Any ideas or if you know who I'm talking about, I'd appreciate it.

From your photos, yours appears to be classic version vs flared "California" version. I have OEM 2L 914 Fuchs 5.5x15" w/185/65x15 BS Pole Position tires. Front have 3/8" spacers to clear brake caliper and give clearnance for center "hub" cap. Rears have 1/4" inch on one side more on other. I have '70 IRS pan. I did remove some of wheel opening extra fiberglass on tight side. I would have like to use the taller/wider 195/65x15 but the 185 seems more popular here. (It had 165/80x15 Michelin XZX and they fit fine - new tires are 1" shorter so glad I didn't lower more way back). I had to use aftermarket taller billet hub caps to clear the front grease cap and huge 36mm rear nut. Believe issue is more tire size than width - offset still issue too.

Thanks for the info Wolfgang.

Appears the OEM 2L Fuchs, Pedrini and Mahle all have ET41 offset i.e. they are 41mm offset from the centerline of the wheel