Hate to bring up a ZOMBIE thread, but this particular car had a metal fitting at the back, with the upper/front fitting still being plastic. I'd replace it at 60-80,000 with the serpentine belt. The $8 package comes with two plastic elbows, so some have plastic instead of metal on the back as well (or I have an aftermarket tensioner, not sure).
I've replaced several of these now, so it'* really a piece of cake. Did the water pump in about 4 hours last weekend.
Sorry to dig up a ZOMBIE thread, but hopefully it helps someone out.