88-89 center caps on my 87 rally wheels

[shannon.posey.56]

Hey there.

I just scored a set of 88-89 center caps for my R10, and have a quick question.  Which lug nuts would I need to hold these on?  I was thinking a short bulged lug nut would do the job, but not sure.

Here's a link to the item:

http://www.ebay.com/itm/CHEVY-TRUCK-LONG-SHORT-STEP-FLEET-SIDE-PICKUP-CENTER-CAPS-PART-NO-15545318-/371323512100?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2047675.l2557&nma=true&si=u57Du0xlgM3%252FApbwLHgcVaDzrZg%253D&orig_cvip=true&rt=nc

Thanks in advance.

[square81]

Probably a factory style nut. They have a small lip on it to hold the cap. Should be able to get them aftermarket. But the nuts may be metric.