Depending the damage to your seat, you may find it more cost effective (this was my case) to buy a good, used seat. If you have a less common color (red, etc.) then you may spend quite some time hunting for this.

I converted from a factory cloth set-up to full used leather interior (with door panels, etc.) and gained power seats and seat heating for a fraction of seat repair shop cost.

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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.