... And the same question for mufflers?
You should be able to utilize any OEM R65 mufflers. The LS versions have black megaphone-looking muffs whereas the standard R65 has chrome silencers.
Note the muffler attach points are on the same chassis bracket as the passenger foot pegs.
The R65 has smaller o.d. exhaust headers than all the other Airheads: 38mm v 40mm. Use caution buying on eBay and other sites that may advertise, "Fits all BMW Airheads." Not so.
There are also off-shore mufflers, particularly EMGO, that sell various styles that will fit the R65 without needing the brass "adapters" offered to fit big muffs to small pipes. Stainless clamps are nice additions, too. Skip the worm-gear style as they do not grip as tightly and they look rather cheesy. I fitted EMGO "Dunstall Peashooters" on both my R65s. Louder than stock. Very cool looking and fit the 38mm headers perfectly.
Larry "LamontSanford" Chabira in Austin TX. Very good guy to work with. Bought my '83 R65 from him.
http://motors.shop.ebay.com/merchant/lamontsanfurdMikey is a large breaker outside of Austin. Knows his stuff. Honest, like Larry.
http://airheadsalvage.com/Rick Jones is
THE Airhead electrical & ignition guru. Alabama straight shooter.
http://www.motoelekt.com/index.htmlThe Airhead guru on the mountain top is da Snowbum. Bookmark his site and refer to it often. Also a good relief if you have insomnia. Wordy but oh so wise.
http://bmwmotorcycletech.info/Many other sources I have bookmarked but these few will keep you busy for several weeks.
Enjoy.