Enlargening the Eyelet Mount for Leaf Springs...

For my 70 Duster with the small eyelet mounts, I have the larger size leaf springs with the larger eyelet holes. I'm not sure what bushings I need to mount them with and exactly how I am supposed to make the holes in the eyelet mounts bigger... I assume I could take them off and take them to a machine shop, but then I don't know what size they need to be. I could probably order a larger bolt, which I assume it would need too, but I don't know what bolt that would be either, dia.

I ordered them because they have a 2-1/2" lift and 6 springs if I remember correctly. My old ones are old, lol. Plus I can use normal shocks with them rather than air shocks. I had a mount kit but someone I had working on the car took them. We parted on unfriendly terms.

If there is anything else I need to know please let me know.