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Here is my Two cents worth of advice. Drill 4 5/16" holes in about a 2" square pattern around the striker hole. V-out the crack so it has even a slight gap. Take a 2 1/2"-3" piece of heavy sheetmetal, drill a hole in the center for the striker & place it on the back side of the pillar. Weld the holes & crack shut...this way you are making the area supported so it is much less likely to crack again. This is one area on our trucks (& early S-10's ect.) that really could/should have been made a double layer. On a side note, (as a bodyshop owner) I'm glad to hear you had trouble finding a shop to work on it. The liability there could be ugly, it's like welding a cracked frame...You really pretty much have to do it yourself. Lorne