I'm a tall guy (6'5'') and struggle to find pantyhose to fit my long legs. Are there any websites out there other than mytights.com that have pantyhose to fit me?

Fogal do some very good tights in tall sizes.

i'm 6 ft tall (thin built) and the leggs size Q fit seem to fit me fine.
there is one size bigger than Q. I think that would work for you if your legs are average sized.
they stretch a bit after the first time wearing a new pair too.
Since they are inexpensive it is worth a try experimenting.

Natalie