Nothing different, Zenoah just found a Walbro from some piece of lawn and garden equipment that has internal fuel passages large enough for methanol...The WT499 from the glow G23 will work with either gas or glow fuel...It's not is stock at Walbro, maybe Horizon would have one, be prepared to pay more than the $48.18 retail price...
There are no special parts, anyone that says so is INCORRECT..
The normall diaphragms work just fine...
If you want to do it yourself just double the AREA, not diameter, of the internal fuel passages, including the 3 small holes under the welch plug..The inlet needle hole is probably large enough..All current inlet needles have a viton tip, methanol resistant...We use modified regular Walbros in our methanol and nitro fueled racers with no problems for an entire race season....