I just bought a set of genuine 15" Fuchs forged "Bundt" wheels for my 300SEL. Instead of the 205/65/15 recommended by Tom Hansen of Mercedes Classic Center, which would match the diameter of the original tires, I decided to go up one size to 205/70/15 as I think the originals look too small on the 108/109s.
GOOD NEWS! They look great as I had hoped.
BAD NEWS! I bought five wheels/tires, and the spare doesn't fit in the spare tire well. The diameter difference is supposed to be less than 1", but that inch matters, so be aware if you decide to try a tire that is "slightly" larger.

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Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang

Don't tease us! I want to see how the wheels look. Post a photo!

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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com

Here my car with new wheels/tires. Replaced rear swaybar attachment rubber at same time and that seems to have thrown off rear height adjust (raised it a bit), so I'll have to adjust that.
Also, my "europeanized" front end.
I've installed a 6.3 tachometer in place of the clock and moved the clock to the lower dash.

Attached Thumbnails

     

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Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang

Sharp! I love the jeweled headlights and driving light combo. That must be a blinder at night!

The only thing that'd drive me nuts about the 6.3 tach is that the 4.5 has a 6k redline, I might look into printing an overlay to go on the gauge or seeing if I could find a vintage tach that'd fit without the redline there (or the proper 6k redline).

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

The engine may be ABLE to rev to 6,000, but it makes peak HP at only 4,750, and top speed of 124 @5,500.
Mercedes' service manual for the 3.5 and 4.5 engines puts the top RPM for tthe 3.5 @ 6,500, and top RPM for the 4.5 @ 5,800.
So if I could get to the dial face without taking the tach out, I would black out the "too low" redline and move it up to 5,800.

__________________
Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
1959 Ford Thunderbird convertible/430
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang

Thank you for posting photos. They look great!

__________________

1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1957 Ponton 220S
2001 S600 Daily Driver
The Universe is Abundant ~ Life is GOOD!http://www.classiccarclock.com

Tire size looks good! I did the same on my V8 Benz and 280C. Jealous of your tachometer.