Alan, An MGB shock body is too big to fit the Spridget mounting holes.
Without going into a lot of detail, there are only 2 different mounting flange configurations for the rear 2 bolt shocks. Small, like Sprite, early TRs, early big Healeys, Minors, Morgans. Big, like Bs, Cs, As, 65 on big Healeys, 65 on TRs, Saab 95 (yes, Saab)
If you can see the number that is stamped on the lower edge of one of the mounting ears, that will tell. If the arm is bent Z like, I would suspect 6076 (big Healey early) or TR2,3,4 with 6058 or 7999.... but it's just a guess;-)
Finally getting my crashed computer up to speed.
Peter C