300zx hubs offset for 6.5 x 15 x 38 mm offset

[zgeezer]

Short story is I have a set of aftermarket s31 4 lug wheels [6.5 x 15 +38 offset] i wish to mount on my early s30.  I have a set of 280z hubs and a non-turbo 4 lug 300zx.  Both hubs have an offset different from my 240Z hubs.

 

I understand that the non-turbo 300zx has a .75 inch offset over the stock 240z.  However, the aftermarket wheels [Fittipaldi]  I pulled of a non-turbo 300zx  have "ET 38" cast into the hub.  I understand ET38 is a +38mm [1.5 inches] offset.

 

Is there any advantage to using the 300zx hubs or can I simply purchase  wheel adaptors that are 1.5 inches thick?  The plan would be to mount 205/215 x 65 x15 tires on these wheels.

 

This is not a race car; but, it does have a mild 6 L GenIII truck engine.  Are wheel adaptors that thick safe to drive?

 

G