70 Duster 340 production numbers question

Tom,

I don't think anybody can come up with an accurate production total on the
Code #J81 'Go-Wing' Spoiler Option.

One thing, there were virtually none on the 1970 'Duster 340', especially in the
Northeast.

I saw a lot of 1970 Duster 340's, and I don't ever remember seeing one with a
Go-Wing Spoiler.