Modifying the ISC Top Hats

I bought these before the car so I would have something to mess around with while I was looking for Alotta. I didn't like that the center hole was not big enough for a bushing and that the studs were SAE (lord knows I would cross thread them). And, there was nothing to locate the spring. So, I bored the center hole out to accept the NB lower bushing and ground off the welds on the studs (Not shown in these pics).