That's correct. ALL suzuki 4x4 trucks have the LARGE front hub, regardless if it is 2wd or 4wd.
The correct BOLT specs are " 5 on 5.5 ".
No one makes a 17" rim that will fit a samurai.
You MUST MUST MUST MUST have the LARGE centers (the hole in the center of the wheel).
The EASIEST thing to do would be to buy adapters to convert the 5 on 5.5 to the standard import (toyota, nissan) 6 lug specs.
With a 2wd truck, the spacers would take care of spacing problems up front with a SMALL center wheel.
That's my 2 cents.
ps. I've got easy access to 6 lug 18" rims, but it's toooo costly to get adapters for the samurai stuff. 300 dollars + for adapters..