package tray, how to cut cut-outs for speakers, 70 Dart

Hello, any ideas if anyone sells a package tray for a 70 Dart coupe, with 6x9 speaker cutouts already cut out? (NOT the speaker holes/slits themselves, but the actual full 6x9 cutout).

How can I go about cutting it up? I'll buy an extra one from either YearOne or ClassicIndustries.

Thanks