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Guys:
What are these two slots for? They don't look factory to me. Are they to help with positioning a clamp during the bonding process? BTW the previous owner took the front clip off..
water drain holes for the plenum area. Both sides look like they have had extra glass put on them, (originally, they were press molded smooth), maybe they were damaged (cracked) while taking the clip off and that owner has reinforced them