Note: All aircraft lenses will require some amount of trimming and drilling to fit your aircraft. A certified aircraft mechanic who is experienced in working with plastic lens materials should do all required trimming of lenses.
Performance Aero does sell a special drill bit
(Pn: 102) that should be used to make all required holes in lenses.
Note: No returns of lenses will be authorized for lenses that have been trimmed, drilled, modified or damaged in any way.