Cobra seats

[Doogle]

Will cobra seats fit in a haynes/saturn chassis? With MT75 box?

Origonally I wanted a pair of monaco's but then decided to keep with weight saving and go with grp buckets, but I think my dad may find these a bit too uncomfy (going to be a shared car) plus I plan on a few driving trips.

I have found a brand new pair of cobra monaco's for sale locally for a reasonable price, so do I go and grab them or stick with the idea of something lighter?
They are monaco pro seats, brand new. I did have some monacos a couple of years ago in a land rover, they were second hand when I bought them so about 5 years old? and quite wide and weighty but I havnt seen their new designs to know if they have improved in any way.
Does anyone have monaco's in their own cars? Fitting is also something Im concerned about to keep the IVA man happy.

Thanks,
Doug.