I have never seen acorn nuts used on Sunn amp handles. Perhaps keps nuts or or more likely t-nuts. More importantly, for originality, you want to find a handle that is cosmetically similar to the original. Early Sunn amp handles were similar to Marshall handles....plastic strap handles with snap-on caps. Later handles were sewn vinyl with snap-on caps. The handles available on eBay are likely the closest to the originals you will find. If you find a better replacement, let us know!