If in doubt go onto the conway owner's website and ask there. There will be someone who is an expert at such things and will help you identify your unit by colour etc. even if you cannot find the plate.
Do you know the serial number? If it is the standard 17 digit vehicular format, the 8th digit from the right is the model year. It could be either a letter or a number and there are charts readily available on the internet to decode it.
------------- Ross & Brenda J.
Keswick, Ontario, Canada
N44.22283 W79.46918