Comfortmaker no longer makes or supports that model. there are a few parts floating around just not the Gas Valve.
The comfortmaker rep I spoke to feels Like I do that a good tech should be able to find a generic gas valve and make it work.
On the other hand parts for that unit are no longer made so. It In my opinion would be better for you if you can afford it would be to replace your furnace. and If I were you It wouldn't be a comfortmaker.
If it were me I would just replace the whole old system to bring it up to date 13 SEER and 410a refrigerant. With warranties or if you like saving money on power and gas bills a higher seer like 18 to 23 SEER. SEER = Seasonal Energy Efficiency Rating. The larger the number the cheaper it is to run. but the more they cost to buy.
the reason being if you try to just replace the furnace the existing coil may not match up/ fit together well but probably could be done, If any other part fails after that you will be facing the same parts replacement problem!! Also the R-22 refrigerant it uses is being phased out. everything is gong to R-410a, And if your coil ever goes bad which they do when they get old they will eventually start to leak. some sooner than others.
At that point you will probably not be able to find a R-22 Coil. and have to change to a R-410a one and will have to change your outdoor unit / condenser to a 410 a also.
I really hate to have to tell you this but it is the God honest truth. I have tried All day to get you that valve. Its just not available.
remember You may still find a good tech that will install a generic valve. but I think you should look for some new equipment that parts are available for and would be under factory warranties.
Sorry I could not get the right part and only offer advice but thats the way it goes sometimes.
Thanks for giving me the opportunity to help.
Do not feel obligated to accept the answer.
Have a wonderful Day