Does anyone know where I can get a set of "A" strut clamps? They are for the rear seat posts on a Sun X2-AX, the posts that adjust the seat back.
 
I had the weirdest situation happen. I rode 44 miles the other day, and as I was heading back my water bottle suddenly flew out of its cage. I didn't think I'd hit anything particularly hard, but when I stopped to get the bottle off the road I saw that the cage was cracked in half. Then, once I got home my seat was wonky on one side, and I found the A strut clamp was stripped. Weird. It seems like this bike has had all it can take lately. (and no snarky comments about it being a good starter bike. I know, I know. I'm looking for another ride, just haven't had any luck yet. gotta find the right price and ride at the same time...)
 
I'm trying to get it fixed quickly, so I can do the ride on Saturday, but especially so I can do the Cowtown Classic in a week. Any help would be appreciated.

Take the clamp to a local ace hardware store, they seem to have stuff big box stores do not carry.  Try using a small hose clamp to hold the strut or if the bolt is stripped it may be the bolt could be replaced. Easy racers has the strut clamp for six bucks.