From Phase 1 you had 3 choices...
Non Lusso 1/2 "leather", Cloth / Vynil side bolsters
Lusso Leather flat Faces
Momo Leather padded, ribbed
Some Momo interiors had either a small cloth tag marked Momo or with it embossed on the headrest, some didn't have any markings at all.
Phase 2 Momo leather became standard accross the Gtv range except Gtv Cup which had 1/2 leather.
There was also Momo Blue line and Red Line interiors where the dash and seats co-ordinated an upgrade on Phase 2.