I too prefer the Tripp Cobra mags. I've used both 7 and 8 round versions. IMO, they are worth the money.
Wall, Do you mind adding a photo showing the difference between the feedlips on the Wilson vs Tripp? That's another area where they are different.
Edit: Last time I checked Tripp offers...
Here's a link I found on disassembly and cleaning Ruger 10/22 magazines, http://www.heypete.com/pete/shooting/rugermag.html , maybe it wll help someone who's having trouble with their mags.
You might need to check this product out. http://www.uniquetek.com/site/696296/product/T1230
Edit: You could probably find all the parts needed locally and much cheaper to do this conversion yourself.