A new memeber from Japan

[Rob Valdez 79 R65]

Also, other than the paint, there is nothing unique about the LS tank from the rest of the twin-shock R65s, so any R65 tank would work for you.

[yf6354084-1983]

Thanks for kind advices, and POR15 tank sealer will be applied which is available and ready here. The matter is rust removing, because they are located right side bottom; can be checked only by small mirror...not enough, can't touch, supposingly the rust is no more because other surface has changed to steel itself. It's something GAMBLE. Good luck for enjoying difficulty. YF

[Rob Valdez 79 R65]

You need to find a small light-camera that you could use to see inside.  (good luck!)
http://www.fiberscope.net/servlet/the-Videoscopes/Categories



By the way, your English is very good.  Much better than my Japanese! (none)