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Rich from Xcessive told me the holes are slightly smaller (maybe a couple thousandths, I don't remember). It shouldn't be a big deal if you're working with rubber, and it wasn't much of a problem with aluminum either... some 1000-grit sandpaper and a couple hours of sanding on the hardwood floor while watching TV and they fit fine. By the way, I had the aluminum spacers machined by a friend and I asked him to make them slightly large, they didn't quite fit the stock manifold either but it's easier to remove some material than add more.
My main concern with the aluminum spacers was there wasn't a lot of seating area for the green o-rings... when I mentioned this to Rich from Xcessive he suggested the rubber FC3S spacers for use with top-feed injectors, apparently they're only a couple of bucks each.
The stock secondary rail should fit just fine with the XS LIM, quite a few people have done that and apparently you need to trim about 1/4" of material from either the stock fuel rail or the front runner on the XS LIM. I put one of the plastic secondary injector diffusers in the hole, it fit fine.
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