16" tires work well for cruising in these cars. I have been happy for over 10 years with them. They work well for smoothness and to my knowldege won't throw off the speedometer much, or affect their suspension adversely.
The lower profile 17"18" or 19" tires could fit ,but may scrub the wheel wells, necessitating "rolling" the fender wells. Complicates on cars like yours that have the chromed wheel arches.
This is why my new wheels will still be 16" The originals were l5" on mine I think. It has the original spare, which was only ever down once.
Go for a replacement wheel lock on yours. Perhaps you could look into it at a good tire store nearby. Maybe they might have one that would fit. As I wrote you my response to this last night in a prev post about that
You are lucky your insurance co is cooperating. Gray Market euro cars give many of them headaches. Their VIN#s are not on the Ins company's databases in their computers.
If the car can't be proven to exist, they dont want to insure them.
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 1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...
1995 E 420, 170k "The Red Plum" (sold)
2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp
1967 Mercury Cougar, 49k
2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive  (sold)
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