Try using a knife blade or flat screwdriver. Pry down on the lens a little, it might be a little tight. I think there are 3 clips that hold the lens to the fixture.
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Jim & Linda with Candy Bar and Misty
'06 Chev 3500 DuraMax w/Banks
'10 Seville
'09 GL1800 Hannigan Trike
GSCM USN(Ret)
ALR,PGR,VFW 3788, AL460