WTB: Front driveshaft from an auto XJ

I'm at ~2 inches now and will be about 4 all said and done. Will the aftermarket shaft fit that? I've done a little research but can't find a definitive answer on what length I need past "from an auto xj."
 
The slip yoke on the the drive shaft can be bought in different lengths it just pulls off the stub shaft an another slides back on so a stock front shaft can be made longer by a couple inches just by swapping the slip yoke .
 
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