Welcome aboard! If the extractors were aftermarket you will have a much easier time tracking them down. If they were made by Brock there may not be any readily available. As a worst case scenario, I'd look at aftermarket Pacemakers or whichever brand you prefer, and keep an eye out for any wrecked Brocks...
Jack Travis, E-Series Acting President
1989 Ford Fairmont Ghia turbo/GL replica (underway)
1994 Eunos 800M
1990 Ford Laser S