Welcome to the "Works" Teacher.
I'm assuming your car is an automatic since you say it clunks when you put it in gear. The clunking and the squeaking are most likely U-joints as you first suspected.
I have seen fiberglass hatches advertised in magazines so they are out there somewhere.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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