I was wondering if the 68's came with the option "antenna in the windshield"
Conventional antennas were eliminated on all 1970 Chevelles.
The radio antenna was now a wire imbedded in the front windshield.
maybe a 70 windshield would fit??
They are the same from 68 up to 1972.
You can use a windshield antenna in the 68. You just need the antenna wiring from a 70 up car. It can be Monte Carlo, Chevelle, Lemans, etc
