That's because you don't need lug nuts for a RF-88, you need them to suit what ever wheels you happen to have. They could be 3/4" NF self-locking if you have center lock wheels, 3/8" NF ball taper, 3/8" NF 60 degree taper, 3/4" NF 5/8" sleeve with different length sleeves, or 11/16" sleeve. I've had wheels with all those combinations and permutations, but i do think your studs are 3/8" if you use studs. Lola's sometimes had 7/16" studs.
IIRC I use 35-40 Ft/Lbs for the 3/8" tube nuts on my RF78. I've never had a problem with them loosening. As far as length, they can easily be shortened on a lathe. If they're too long, they can bottom on the hub face.
40 ft lbs is what I use on those wheel nuts. They will not work loose if the studs are not stretching, if you have the correct washers under the heads, and the fit is correct. 45 ft lbs could have started to strip the interior threads, I have seen that when over-torqued. Usually the studs are a lot tougher than the nuts.