Wow, it's great to see so much Spiral/Rita love here!
I'm not sure what are you refering to. Longshot never had another series apart from 'Longshot saves the MU' (4 issues). It was planned when he quit the X-Men, yes, but it never came to an end.
I guess this is the closest we have (UXF #6):
In fact, Ann Nocenti never meant Spiral and Rita to be the same person. Spiral was (presumably) a bioengineered creature desing and built by the Spineless, exactly the same as Longshot, Quark and the other slaves from the Wildways. I'm now reading 'Prisoner X', a 1998 novel by Nocenti, and she intentionally ignores the 1993 canon established in the 'Shattershot' crossover: Rita and Spiral are two separated characters there.