The reason I said 5/16 or 8mm was because all the Jeeps I've worked on lately had 5/16 bolt heads on the u-joint straps and there is virtually no difference between the two sizes. Those do look smaller (now that I have my magnafiers on!). I have found one or two metric nuts on my CJ in other places (power steering pump area) but I can't prove they came on the stock Jeep. <img src="/forums/images/graemlins/cheers.gif" alt="" />