I was looking to pick up wheels for my UCF10 and I'm wondering if a set of Work Euroline DH's with "Specs (18x9+25 18x10+23)" Would fit without sitting to far out from the fenders

 

You'll defitely have to roll your fenders, maybe a slight pull.

 

fitment is more than just wheel specs. what tire size, brand, and ride height are just as important. these specs are considered flush and will fit depending on the other factors i mentioned. minor fender cutting/rolling might be necessary.

check the wheel thread but here is an example. as you can see there is plenty more room out back.
the 18x9 +25 will be 1mm less than what is pictured here up front.
the 18x10 +23 will stick out 13mm more that what is pictured here out back.

 

many threads on this. Can't answer your question without knowing what work you're willing to do, what tire sizes you plan on running, and how low you plan on driving the car (aka what suspension modifications you've made/plan to make.)