Take the model number and serial number to your nearest heating spares shop and ask them,they may have to phone Leisure to get a part no.
If you still have the instructions you can phone them yourself and ask for your nearest stockist.
Either way the conversion needs to be carried out by an LPG qualified corgi engineer (call corgi on08704012300 for a suitably qualified engineer in your area).
Hope this is a help.
Pete 100%Heating
Peter Brown
November 2006