Dannyboy7

Caterham have replied and stated that the current S3 FIA half hood in their range will fit both FIA variants (double and single diagonals) which is a bit confusing as Thundersports state they won't.

Stephen, thanks for the info. The reason for my original post was that there was a hood for sale for a third of the price of a new one. If it then needs to be modified I imagine it would probably be cheaper to buy a new one. Trouble is they are currently on a 10 week delivery from Thundersports.

Yes I think you have confirmed my doubts, just looking at various pictures it does appear that the single diagonal bar version has vertical uprights as opposed to inwardly sloping ones of the double diagonal. Just looking at the Thundersports half hoods on eBay it does actually state that they are not compatible. So I think that is the answer. I have also sent an enquiry to Caterham for clarification as they advertise only one type of half hood for an S3 FIA roll bar. I will post their reply for the purposes of completeness. Thanks for your input.

The one I'm looking at is a Caterham one but that is a good idea, I'll ask Caterham. Thanks.

Does anyone know if a half hood from an S3 with a FIA metric trackday double diagonal roll bar will fit an imperial S3 with an FIA single diagonal roll bar?