15" steel wheels 1986-1990 W126

[JQ]

I am looking for 15" inch steel wheels to fit on my 1989 W107 SL. Wheels that fit late W126 for sure fit my 1989 SL. I guess that there are 15" steel-wheels availabel for late (1986+) W126 (e.g. for winter tires). What size are they? 6,5 x 15 ET 21,5 or 7 x 15 ET 25 or something else?

I want to have the 70´s style look on my late SL. Does anyone know if one could fit 15" 70´s style hubcaps (from W123 or W115 long wheelbase or heavy duty models) to these wheels?

Second question I guess is dificult to answer if you have not tried, but first question I hope someone could answer.