1969 Dodge Dart Gauge Bezel Lens Replacement

Needing some advise here. I bought a new replacement bezel from PG Classics(316-D67 Mopar 1967-69 Dodge Dart Gauge Bezel) for my car. The item looks very nice but it does not include the lens. I did not buy one ($136) as my original looks good. My question is, how do I remove it from my old one and attach it to the new one? I have also looked at the one they sell (316-D67LEN Mopar 1967-69 Dodge Dart Gauge Lens) and it does not seem obvious. Do you some how "weld" them with a soldering iron or something? Hot glue?? Thanks for the help!!!

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