possible new alloys

Just a  quick question, I have a chance of a set of 5x112 15" 7j alloys from a Mercedes worth a 37offset.  I'm assuming that using 4x100 to 5x112 adapters with with a 20mm spacer will be OK to fit on my cabby also would a 195x50x15 tyre be ok .will that fitment work or look stupid. Any help would be great