20" wheels for a 6 lug

[brandster]

Found several wheels that I like but not sure how they will fit. I still have the stock 6 lug drum brake setup. This will be going on a 68 c10 and will be using the same size wheel for front and back. The wheel im looking at has the following specs:

Backspacing: 5
Wheelsize: 20
Wheelwidth: 9
Hubbore: 108.00
Offset: 0

Will I have issues with fitment? If fitment ok, will the wheel sit inside fender well, about even with fender well, stick out past fender well a little?

Never really understood wheel specifications, any help appreciated. Thanks.