Its a Final, a one off game and should be split equally, as much as is possible. It shouldn't matter how big either club is. The FA Cup final against Man Ure three years back, both clubs got 25,000 each, despite Old Trafford holding 30,000 more than the bridge. Cup final last year, Pompey got the same amount as Chels, despite their ground only being half the size as the bridge. Should be as even as possible. Only gripe with the FA Cup was 40,000 tickets going to sponsors, corporate and all that malarky.
Motherwell will probably get all the West end and half the main stand which is what?, around 18000 maybe?