Use the Strothers String Gauge calculator to tell you what gauges to purchase.
Tom & Missy Strothers | String Choice

Plug in the VSL and the Note you want to tune a particular string to, and it will tell you the gauge.  

I have my 5 string Perfection pegs to replace original wooden pegs now. Only minor bushing required.

Now it is set for a double Melody string and equal spacing on the other 3.  I found the "Extended range" set up. Are there any others commonly used?

if so, what string gauges? It's a 28 1/4 " VSL, older instrument