The Orbit Z won't work. That's what I use on my XLT. It's an Internal Cup Type headset like the Cane Creek Zero Stack. It's kinda like an "Integrated" headset except it comes with cups that press in. They are 44.0mm diameter which is larger than the std headset diameter. This way the bearings fit down in the head tube instead of just the cups. The Orbit Z cups won't fit in the head tube on a standard setup. It's really kinda like a cross between a standard headset and an Internal headset. The total Integrated design doesn't have removeable cups...the cartridge bearings just rest right in the head tube. If they ever get loose and start to waller out the head tube...you're screwed. At least with the Zero Stack type...there's a cup to press in and replace if need be.

Either way, I think you're hosed, maam.

What kind of frame is it...I forget?