Manual Driver Seat Slide Broke

The manual slide mechanism on my seat broke last year, some flimsy plastic peice, I'm sure it breaks all of the time. At the time, it looked like I was going to have to buy a whole new seat which is ridiculous to me. At the time, I just shot a couple of screws through the slide rails to lock the seat in place.
Anyone know where I can find a new plastic slide lock mechanism for a reasonable price, or are there any other fixes available?
Thanks in advance for any help.