Hello Larry,
I have a second hand pair for sale at the mo i've just removed from my XR2 Race car.
Don't worry about all the balancing b*llocks, if you have a basic knowledge of mechanics it's easy - they're far to much crap surrounding these babies !!!
I have two spanking new K&N filters to go with them too - never got them on the XR as there's not enough room with the strut brace!
If your interested give me an email on david.hawkins@ttmc.co.uk