Pretty much any skid will fit in there. the biggest thing is u will have to change the mounting holes a bit depending on what skid u put in. I guess its all in how much u want to spend. Xtra 10 will fit, edge skid will fit. a xtra 12 will fit but it is a pain in the A$$.
there is a site that gives u center to center measurements to change skids but i cant remember the site right off the top of my head. i will look for it and if i find it i will post it. Hope this helps.
CK