I used to use Jackson speaker as well. I now send my stuff to Utah Speaker Reconing:

Utah Reconing

Phone
801-419-3099
redmatt2@juno.com

Address
Utah 84084
United States

70 Road Runner 383-4 4 speed FJ5 & black guts
70 Charger R/T 440-4 4 speed FJ5 & white guts