I didn't know Elixir made stoves/ranges. I had thought Wedgewood was in the older Sunlines, but maybe not.
Elixir Industries may have spun off the stove/ranges a long time ago. I cannot find any reference to them. Even the original web site does not seem to work. I found this which which is linked from the elixirind.com but they do not mention stoves/ranges
That said, you may be able to find an aftermarket knob set that would work. There are lot of the generic knobs for sale.
Here are a few places to start
Camco seems to make a universal kit
If you strike out trying to find something, post some pics and check your dimensions or where you are measuring and we can see if we can help you hunt. Do you have calipers or just a tape measure?
A 9mm stem and a knob of 10mm, is the 10mm the hole in the knob? Even that seems loose or they have some kind of spring to take up the 1mm clearance.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club