What spring perches for truck 8 3/4?

Going to be doing axle over spring to drop the rear of my 73 d100.

I see a couple different center pin hole sizes. I'm nowhere near my truck at the moment so I can't just go and measure anything.

What perches do I need? I'm using the stock 8 3/4 thanks in advance

If I recall correctly I got mine from Mancini and my pin/locator was slightly larger than the hole in the pad so I threw them in the drill press and opened them up to fit. Just finished helping my cousin flip his and they fit with no modification...go figure .