Are the Fibresports ones Fibreglass or Poly?
Id be looking for a polybar , it might cost a bit morethan glas, but it will be stronger.
If it was plastic welded properly, it will last as long as you dont do the same thing again.
Dont do this with out insurance guys. I got qoutes today, all around $2500, front spoiler is 2 parts, each worth $750 - 900 each. They will dismantle the whole front to put in all back together in one peice. Ouch.
I did this to my car once. Went to the local shops and parked. Didnt notice the front spoiler over the gutter. Backed up to go home and yep, cos the cars lowered the gutter just ripped off the left hand side of the front spoiler. I was cursing. Tore it in the middle. Had to replace with new spoiler. Bout $500 and a couplke hundred to paint it. real dumb thing to do. Im alot more careful nowdays