Not really too hard to get a copy of CASA flight manual. However I wouldn't worry too much about being familiar with an airplane you flew a little bit 17 years ago, especially as SIC. In fact the interviewer might actually see a red flag if you could recite the flight manual after that long. It wouldn't hurt to recall something, perhaps unique, about it though. You are apt to be asked more in depth about some equipment you have flown more recently. BTW, your last sentence should make a satisfactory answer if they inquire.