Car Mat Template Style?

So it’s time to start tackling my tatty interior with a good clean on the carpets. I’d like to finish it off with a nice quality set of mats, however i’ve noticed various templates for the GTO. She’s under cover at the moment (being lazy) would anyone know what style of mats I would need for my 1991 GTO? I’ve seen ones with a slit in the passenger mat and some without. Confusing. Cheers Paddy