Yes, it all applies to the R65, R45, R60, R75, R80, R90, and R100 from 1971 - 1995.
Chances are probably fair that your filter setup is OK if you haven't destroyed the engine already, so the key thing is to make SURE that you put all the proper parts back correctly, and renew the white o-ring. Remove the cover carefully and you may not need to replace the paper gasket(s) (if they are there, or they may stay stuck to the engine case). Just be aware that there is supposed to be 1 metal shim (or in some rare cases, (2) thing metal shims) between the o-ring and the inside edge of the oil filter canister in the side of the engine case. The o-ring that you pull out with the old filter should like SLIGHTLY square in cross - section, from being squished a bit -- that indicates the proper amount of compression of the ring and a good seal. If the o-ring still looks pristine and round in cross section -- it isn't being squeezed enough. Likewise, if the ring is cut to bits or severely mangled/flattened, there is too much pressure or something has been messed up with the shims.
It isn't a difficult thing to do, but it does require a bit of thought the first time one does it. But once it is done right you just have to do it the same way going forward with that bike forever. Each airhead's tolerances in this area can be somewhat different, so there are some allowed variations.
I would buy the filter kit from a BMW dealer at least the first time and make sure that it is the oil filter kit with the new o ring and paper gasket (and these can come with a new metal shim as well).
Do you have a good metric dial caliper with a depth gauge, or, at least a steel machinist rule? We check the depth of the cannister by measuring from its edge to the outer surface of the engine case, usually in 3 places (ex at "10", "2" and "6" o'clock positions around the circumference of the hole in the engine case ) and average the measurements. Generally, if your cannister depth value comes out between 2.9 mm to 3.3mm, you should be fine with the 1 metal shim under the o-ring, and 1 layer of paper gasket on the engine case under the oil filter cover. If the depth is 3.4mm or more, then one may either try to change the cannister depth (I never have) or you use a combination of perhaps 2 metal shims and 1 or none paper gaskets under the cover. IF the depth is much less than 2.9mm, then one can try to change the depth of the canniseter (again, I never have) or use the 1 metal shim and multiple paper gaskets under the cover. You must always use at least 1 metal shim in the hole first to protect the o-ring from being cut by the edge of the inner cannister. You may also find that since the shim is stamped out of sheet metal, one side has a sharp edge -- put that side "IN" the hole first so it doesn't tend to slice into the o-ring either.
