spring relocation

So I'm moving my spring perches in, they measured 3 1/4" so 4" in from inside flange to the side of the perch. Teaches it in for tonight. Used the other side as my datum at 0 dog with my angle gauge so now I can cut other side off and tach it in as well. My question is while the tach welds were cooling I tried to put in my front mounts in looks like they are hitting a flange. I need to clean and paint the area before I put them in but was doing a test fit. How to you go about fitting these in. Looks like I need to drill a couple holes in the frame for the bolt. Larger on inboard and smaller on the outboard. Attached several pics.

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never seen that exact type before but, are you sure you have that front perch the right way around - isn't the threaded nut supposed to be to the inside... as in toward the frame??