firstly i m not sure if they are a real leather ,,
second if u find on such product it wont be able to patch it 100% correctly,,and the product wont be cheap will be above the cost of a seat..
so as r1 pointed u to have ur seat cover replaced is god ,,
also cheapos will be available ,,
the guyes who do seat repairwork usualy charge 400 for seat adjustement (when foam has pressed too much ,, they raise it by attaching foam from a salvaged seat) .inclusive of the new cover, so new cober will be cheap