First you contact a Elka, decide what stage of shocks you want, give them your quad info "2007 CanAm Outlander EFI.",your weight & if you normally have a rider or the weight of your usual cargo, your style of riding, how plush you want your ride etc... They will build your shocks to suit, you install, then you experiment with the settings until you are happy with the way it rides. Easy Peasy
I wouldn't think so, because they would have been built to suit your weight, riding style etc..
2007 & 2010 do not have the same front suspensions, those shocks will not interchange, unless that 2007 has been modded as I mentioned in post #9.
The rear shocks of both 2007 & 2010 will be the same, but that is it!