Don't under stand your question.
Spurs are I believe the remains of hind legs in Boids(pythons, boas, annacondas). Not sure what other snakes have them. Both male and females have them but the male's are usually bigger. The male uses them to "tickle" and stimulate the female into breeding. They are on both sides of the vent.
Hope this helps
~Jake~
Too many boas to list and a few balls as well