Are the gaskets still avaiable for the 7 Inch guide lights?

I think the bigger question is Are the lenses and bulbs still available for the 6v 7" Guide lights?

I can't say about any gaskets...

My old headlights on my TEN used a rope seal. But they are Osgood lens and buckets from a 1928 Buick.

If the Guide lights used those big Mazda lamps, YES they are available. You can also get them in 12 volt too. I bought the 12 volt ones because I converted an old Delco generator to put on my machine. Just be prepared...they were $6 a peice and you have to buy a box of 10! At least I had to from NAPA.