F-spaced neck pick-ups can be ordered, but are not very common. Mostly your neck is normally spaced and your bridge is F-spaced (for Floyd Rose type setups_.
Got to Dimarzio.com and check out the frequent ask questions. Answers should be in there.
As you say you have F-spaced neck and normal spaced bridge.....what I think is unlikely......you might wanna swap out the bridge and neck pup.
And did you read the reviews on www.harmony-central.com
(or so) on these type of pickups??? Seem like you ordered something you weren't even sure of how, what and when.
There is tons of info on pickups available........Most people don't like the Evo in the neck. It;s nice Bridge pup though (if you like that kinda sound).....
Most people want from their JS
style guitar....a JS
type of sound. If you want Steve Vai type of sound (hence Evo's)......why not go for RG or Jem style guitar......and some don't care and want Vai style sound from JS
style guitar......hence....ordering Evo in the US.....
Again....it;s al what you're after.....and if you did get the wrong pick-ups....you might wanna should email to dimarzio and ask if you can change bridge to neck and neck to bridge......or swap them all together for new good set.
Again. Do your research....cause to me it sounds, you order something without really knowing properly what you ordered.
And then again......even the best informed buying must send some pups back, cause they sound different then expected.........