Well, just got really grubby messing with the wheels - the one with least overpainting and muck on was missing the vital numbers, due to tin worm. So I had a dig at another one:
4.00B x 13H A447 12 92
The age at the end is correct for the age of the car.
But even with my glasses on I can't see anything like { }-00" in there.
I had wondered if it would be a bit wider as I had an exchange of views with someone in another place - he convinced me the wheels were different on the S and CLX.
Anyway, if I can do the thing with village photos again here's a snippet from the drivers' book ( from the CL )
Now I'd have thought that might be the end of the matter, but as the CL is unexpectedly home this weekend, and I had a look at its spare... would you credit it!
4.50B x 13H
with the 135 tyres on [:0]
So there I'm stuck, and a bit confused.
I suppose one of the many previous owners of the CL could have interfered with it :I as it does go rather well.
Or it may just be the FIAT thing of using the bits that are to hand when they make things [V]
I'm not sure I'll ever find out.
One final thing the B in the wheel size is to do with the flange shape. There are others. J is more common.
But what the difference is remains a mystery to me.
Sorry about not sorting any advice about offsets and SEI wheels.
Regards
John H