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Things begin to get complicated when you factor in the range of polepiece spacing arrangements now available and, in a few cases, the sizes of the polepiece screws themselves.
In the specific case of Lollar, he is known to be a fastidious designer. It is not unreasonable to assume that the open bobbin pickups you are considering were designed and developed to sound the way that they do WITHOUT covers. If the same model is available with covers, Lollar could be winding it slightly differently to arrive at the same overall sound.
If you want covered humbuckers and a specific sound, buy that combination.
You could argue that it's not just aesthetic, as a metal cover will affect the tone somewhat.
Edit: here's your answer http://www.lollarguitars.com/blog/category/pole-spacing/ 50mm for Gibson or 53mm for Fender spacing Lollars.
My comments were founded on the idea that the OP has thoroughly tested various replacement pickups before deciding which make/model to purchase. As opposed to the more simplistic approach of, "this is reputable brand, at a price I can afford, I'll give 'em a go."
Interesting theory
Sounds harder than it actually is.