Saab 9000 is 4x98 or 108 fitment as they shared parts with Alfa Romeo, Fiat and Lancia
saab 5 stud are 5x110 as you can stick them on 5 stud vauxhalls
The ebay link you posted was for the old 9000 (which was 4 stud), only later Saabs were 5 stud and not all were 5x110.
I owned a 9000, an have only just sold my 9-3, both 5x110, 
Not all 9000's had 5 stud wheels, most were 4 stud (worth remembering they were built and designed a long time before Vauxhall came on board)
Saab 900 (1988...1992): 4 x 108
Saab 900 (nuo 1992 m.): 5 x 110
Saab 9000: 4 x 108
Saab 9-3: 5 x 110
Saab 9-5: 5 x 110
900 87 to 93: 4x108
900 / 9-3 87 to 93: 4x108
9000 87 to 98: 4x108
New Alfa Romeos (Bera, 159 and 166 have also gone over to 5x110 as well)