LCA question

I am putting on a 3" lift and found a guy selling his upper and lower control arms for $150. He doesn't know what brand they are because they came with Jeep when he bought it. They look to be in pretty decent shape and measure 16.25" from center to center on all four.
Will these fit my 3" lift? and does that price sound reasonable?

I have a 2000 Sport I-6

Thanks so much!

just for fun

http://lmgtfy.com/?q=XJ+control+arm+length

first off the lowers are a little too long for a 3" lift... they will push your axle forward about 1/4"

and the uppers are WAY too long

are they adjustable or are they fixed length?

Right, the uppers should be around 15" for a 3 inch lift.