All of the issues associated with trying to fit a LED bulb into the stock headlight assemblies is why I just gave up and installed a purpose built headlight assembly
And an exceptional light it is too. I showed the specs to a friend who owns a truck and often drives at night. Whilst like most trucks his has spot lights, flood lights and "dip your bloody headlights moron" lights fitted the problem was those occasions when due to oncoming traffic all the "big" lights are off. He wanted good vision without blinding oncoming traffic and the "speakers" fitted the bill perfectly.
To return to the issues of fitting LED headlights to the R65, your problems may be lessened or compounded by whatever BMW fitted in your jurisdiction (and of course what those ever helpful POs did to the bike whilst in their hands.
in various locations BMW supplied the R65 with (what I call a component) headlight consisting of separate lens, and reflector, elsewhere got either a semi-sealed Bosch headlamp (which is now NLA world wide except for the individual in Switzerland who bought a quantity of them at an auction and who has beeen drip feedign them onto the market via eBay at around $AU200 each ever since. He selles them by Bosch part number so put that into Ebay search if you are well heeled and want one. They are "right dip" lenses so unlawful for Australia, Japan, UK etc that drive on the left.
For a period of time in the 90s BMW Australia was supplying a fully sealed beam for a time, when local supplies dried up there were no more. rumour has it that they were made for an indigenous car maker (Holden) who then decided to go with a more "standard" sized lamp body.
Finally, you get whatever a PO fitted when they either could not buy a genuine lamp, didn't like the price or wanted something better.
I have an original semi-sealed lamp courtesy of a former member here and whilst there was insufficient room for most fan-cooled LED bulbs, I was lucky enough to buy one that did fit. It had the micro-adjustment so you could correct beam cut-off (I thought they all did, but apparently not). As to what brand etc. I've no idea as I bought a number of cheap kits knowing that i would use them all, one way or the the other.