Why would they Gav, you are already doing the S30 chassis for them. ?
Seriously though, where is the benefit for Nissan? They are not producing oem parts for cars much older than 10 years anyway, so why catalogue info now?
I know bugger all about Porsche parts but I think many parts are still available. Also, I think there were many more options available to each chassis type hence needing a record of each vehicle sold.
Mick