I'm sorry for writing English here, since I don't speak Polish

2 weeks ago I bought an oldie N126 (1988 y.) and I'm happy now to rebuild it by myself.
But there is a problem finding steel wheels for my little "house"

d=12"
inner hole diameter = 58.6 mm
width = 4.5"
and...
ET = 25 mm, 28 mm, 35 mm, 38 mm.
Could you help me choosing ET for my N126? Is 4.5" width suitable for Niewiadow?
Thanks in advance!
P.S. Once again excuse my English in here. I understand Polish somehow, but cannot speak in it.