Probably cheaper to have a local upholstery shop repair it and certainly a
higher likelyhood the vehicle will look like it originally did.  If the
leather seat comes apart like the fabric upholstered lumbar/bolster
adjustable seats it's pretty simple to take apart.  I bought an insurance
right off to repair that the lower frame broke in the accident.  Very simple
procedure to remove everything, 5 bolts including seat belt get it out of
the car, 3 bolts remove the back, 4 plastic channels to unhood from the seat
frame, 3 hog rings and 2 metal clips to spread and it's off.  Take the cover
in and have the worn segments replace.
Steve