When was the first xj8 convertible made ?,

I have a 1996 xk8 convertible engine number 96-05-17-10-11 vin 001692 . Have asked Jaguar Heritage Trust what numbed/when it was made but they only tell me that 48 were made in 1996,they have not got any database info,would there be any other way to get some more info on this,thanks to anyone can help,Murray