Spiderman suit store which makes ass zippers?

Hi, I am a happy owner of three different spiderman zentais from Herostime and Zentaizone. Of course I have the cock zip option :-) But I ask, is there any other high-quality manufacturer which offers an ass zipper option? (or an all around cock-ass zipper, as on many latex fullsuits) I have considered modifying a suit myself, but I think the results would be better if it was factory-installed ;-)

I'd love to know this too. Boyfriend would probably ask me to wear it more often.