I have triton grp seats as do a few roadster builders and they are brilliant
You can drive for a couple of hours easy and feel no worse than if you had been in a tintop
You can also get them coloured to suit your car if that sort of thing does it for you
The only problem you may have with them is if you are sharing the car with your dad and he is bigger than you he may need a wide seat but if you resemble a rake
you would need a standard seat
I have wide and fit perfect, but im by no means wide!