i found thìs wheel and it is 20" x 9.5" and has a +5 offset.i don't know the backspace of it and i would like to know if i have to worry about the clearance on the inside.in germany you don't get information about the backspace.it is 6 x 5.5 but it is suppost to get on a nissan truck.
it's a 2004 sierra 2wd and it is stock height.
what do you think or are there any other things to pay attention to ?

 

they wont rub on the inside any, but they will probably stick out some. Are you sure those are truck wheels and not for cars? They look like they ahve a fwd offset

 

make sure they are hub centric and not lug centric

toyota has a 6 on 5.5 but are lug centric for gm trucks

not sur eon the nissan wheels though

 

hm
i don't know if they are hub or lug centric.
they sell the +5 offset for the nissan patrol.
www.smcwheels.de the homepage is also in english.
6 lug wheels are not common over here.

 

the center bore is 110 mm.what size is the gm hub ?
if it is to big do i have to get some centric rings ?

 

the gm hub is around 78mm, you will have to get hubcentric rings. when you do, dont get the metal ones, get the rubber ones