Tire- size conversion to metric...struggle

[Basoline]

Hi,

I'm struggling with tiresize conversions here...:confused:

Bob Mosher adviced me to run these wheels on my Coronet to give it a more Super Stock look:

front: 7/10/15 on 4.5" American Racing Torque Trust D's
rear: L 60 15 on 8" steelies

Now...about those tire-sizes...This I what I found:
7/10/15 => 205/70/15
L 60 15 => 275/60/15

Is this correct?
It has to look something like this (OMG!):

Thanks!

 

[69 Runner]

If memory serves me, a 79 Lil Red Express originally came with L60/15's which are a 275/60

 

[Basoline]

Weld Racing Draglites are gone...

Steelies are ordered (15x8), TT D's are ordered (15x4.5). I want to paint them first. The steelies will recieve body color (which is Viper Red) and the TT's are going to be bronze. After that, I will order the tires.