Uh, no...not unless you can weld up and redrill the hole. That's typical of extreme neglect of lower trunnion bushings...which makes me think that I don't want to see photos of the trunnion itself! :shocked:
Frankly, it shouldn't be difficult to get hold of a much better A-arm. They're the same for all Spitfire, GT6, Vitesse and all but the very, very earliest of Heralds.