If you have the part #s you should be able to order them through any of the parts houses that deal w/ LR classic parts (RN, AB, BP...).
I replaced the guide rails in my sunroof a few years ago, a major PITA but cheaper than a new one and more reliable than a used one...
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"Guinnevere" '91 RR
'08 LR2 SE
'05 MINI Cooper Convertible
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