Some research that I have done on rim sizes and offsets:
Original rims and tyres in 22" are 275/40-22 on 9.5 rims with +49 Offset (on my RRS)
20" wheels were 255/55-20 on 8.5"rims with +47 offset
This thread here shows that 9.5 x 20 with a +53 offset won't fit on the front.
This site has some useful info on the original fitment wheels and tyres.
It seems some L405s may have had a 9.5x20 rim with a +49 offset that might be an option but they may be thin on the ground.
As others have found a 275/55-20 running on the +47 8.5" rims would seem to be a good compromise. I've also discovered that 285/35-22 was never an option and that explains why my speedo is over 10Km/h fast.
Regards,
Tote
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