As far as the fender struts go, if you want to use the RT bags or RP bags, you need the RP-style struts.
You also need those struts without bags, if you want to mount the shocks in the "Buell position" (more upright) instead of the "Willie G position" (more angled).
The 92 frame has the shock mounting holes for both positions.
If you want the more angled shock position, you need the 87up fender struts.
Are you asking for the torque or the type of bolt?
Type of bolt go to Ronnies HD and use their parts finder. You can punch in year and model and it will give you the schematic and parts numbers you need. If you want to source the bolts yourself you can then google the parts numbers and that will generally net you the bolt size information.
Most every bolt on a Harley is 5/16 or 3/8 grade 5 coarse thread, except critical fasteners like brakes are grade 8 and motor mounts are fine thread. So you can get the bolt and nut that fits the hole and is about the right length. Fender bolts can't be too long so they won't hit the tire.
Have you considered going to one of the many online oem parts finders and searching for YOUR specific model and year? The nuts and bolts are not obsolete, but that is irrelevant, once you have looked up the oem part numbers you can then convert them into common SAE sizes. Its not hard. That being said, if you are asking about bolt sizes for fender struts, well, best of luck with your project.