gl_wireframe 2 is the second one. Also try 1 and 3, can't remember the differences.
impulse 107 is for the first, but I think you have to be running HL in developer mode for both/either of these to work: to do this, change the command line for HL to summat like:
c:sierraHalf-Lifehl.exe -dev -console
or if you had it somewhere else
d:HLhl.exe -dev -console
Hope you get the idea.