Help with wheel size

[Orence1]

I am on the verge of ordering some 15"x8" Polished Torque Thrust II wheels for my 72. I want to make sure that they will fit. I took a front wheel off and measured the following using a straight edge across the wheel rim and a tape measure. Here is what I got as close as I could figure:
Backspace (flat part of hub to rim on back of wheel) = 3 1/2"
Offset (center of wheel hole thickness to rim on front of wheel) = 3 7/8"

The wheels that I am looking at are 3.79" back space and -18mm offset. (See picture)

Do you see an issue with the fitment of these Torque Thrust wheels? My primary concern is the front. Thanks in advance for any advice.