Off-road Campomatic Ranger GL camper. Rubber seal

Try Chris at Wallaby Track Canvas.

He's in the Blue Mountains west of Sydney

The Victorian Dealer for Campomatic is listed as Bush & Beyond at 12 Mercedes Ave, Thomastown.
They can do the job for you, or if you choose to do it yourself, you could contact them or the head office in NSW and buy the seal from them.

Campomatic Dealers.

Failing the above tips, you could try the rubber specialists in your region - in Adelaide we have the likes of Fitch the Rubber Man and Clarke Rubber as examples - those sort of merchants carry strips, mouldings and fittings etc. to cover a host of applications.

Thanks guys for your replies. I prefer to buy the moulding if possible. I've now got some leads to follow up. Cheers.