Crossman Mod. 1377 repair help

I pulled my old Crossman 1377 pistol out of the closet a week ago and oiled the seals but they didn't expand to make the seal to pump it up. I searched for the repair kit and found a couple of different ones. I haven't used it for a couple years. So now I need help with which kit to buy and where to get it. Having trouble uploading photos into photo bucket right now but will add some when it happens.