Used crosman storm xt rebuild?

Last time I did a tune up on my XT I had a bear of a time finding the breech seal. Crosman didn't have them. In fact I think the lady on the phone said they were discontinued. Another airgun forum member had a spare and gave it to me. The piston seals should be easy enough to obtain. When googling, put in B19 piston seals. The storm, like most all crosman spring guns was patterned off the B19 Chinese model. 

Good luck finding parts. They are great guns for the price. Or at least mine has been:)

Ray