I' m about 5'10", not as slim as I used to be. I intend keeping the original seats as I keep most of the original bits from the car, I may want to fit them back sometime. I rebuilt the seats twice, first just new covers when I bought the car and then a couple of years later I replaced the foams, they are still in good condition, drivers seat a little worn, passenger like new. I dont like the fit of the seat back, seems too narrow and I feel I am sitting on it rather than in it, the head rest covers never fittied very well. Perhaps the problem is the fit of the covers?, I got them from Prestige Auto trim about 10 years ago. The argument for MX5 seats is not convincing at the moment, I may have a word with Park Lane classics before I make up my mind - I could have coloured piping then :)