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santino
@conquistador
Have you done a stress analysis for this?
Your hole size and the proximity to a weld are going to concentrate the stresses a lot especially if you do countersink them which sounds like a disaster. Three smaller fixing bolts might work out better than two big ones if you do the math for your available area, as you want to design it so the fixing bolt fails under load before the frame does.
Your main problem is going to be getting them parallel. I'd use a threaded axle with nuts on to bolt the track ends to, keep adjusting until width is perfect fit inside the rear spacing then assemble a jig around this and rear of frame for marking up and assembly.
There is not a right way for doing something wrong, just less wrong ways of progressing towards A+E