starter motor?

Hey guys, just trying to confirm what i think is the problem. i have a 2001 skoda fabia 1.4 8v classic and everyso often when i go to turn the ignition there is a clink sound. was not sure what it was at first but after a while i just gave the starter motor a bash and hey presto it works! But im selling the car now and i want to repair for the chap who wants it (he says he's not to bothered but im fussy).

Which starter motor do i need as theres a couple of diferent models.

Cheers in advance guys