So I shot an email off to the spidertrax folks asking about using their 1.25" spacers on the WK and this is the response I just got. Hope it helps.
"The WHS-006 and WHS-010 are identical except for the thickness. Because of the stud length on the WK, the 1.25" space will be a little short and the lug studs can extend past the wheel mounting surface causing the wheel not to seat correctly. If you were to trim the studs to a height below the wheel mounting surface you would be able to use the 1.25" spacers."
Khaki WK Club Member #22
"Nothing sucks more than that moment during an argument when you realize you're wrong."