The "Flexiglass", or "Truflex" bumper coversare a better choice. Still fiberglass, but they have a little "give" to them...they're flexible to an extent, and are easier to fit to the body than the solid fiberglass covers. They will also give a little without cracking if you happen to bump into something(or someone else bumps into you).
As far as I know, NO-one is reproducing the two piece rear cover in the original urethane, but the front cover is still available in urethane....for a price....$$$$
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Joel Adams
C3VR Lifetime Member #56
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"