Brian.
I went hunting for Summerfield Engineering in Kenwick to see if they can do a 18" D4 steelie,it seems they are gone.Just did a google they are now in Baldivis.
In the day they were the people to see for rim conversions for 4x4s and drag racing.They may be able to knock up a set of wheels for you.IF you are talking to them,see if they can do an 18" rim too.
Andrew
Summerfield Rim Conversions (Used to be Summerfield Engineering) - Wheels & Rims - Baldivis

