I can't find this part anywhere: 3192157 for left front gas valve for kitchenaid gas cooktop kcg166gss2
No other part is listed as a replacement.
There are 2 other valves in my cooktop and seem to be available. Could I use one of these, 3191293 instead? Are the specs different? Is it safe to use?

The only difference , in most stoves , is the BTU output. See if you can physically swap one of the other burners. If so, and it lights, order that.

Go to web page below. Part appears to be available $66.

http://www.searspartsdirect.com/partsdirect/part-number/3192157/0022/664?pathTaken=directMatch&filterPart=&pop=flush&prst=0&shdPart=

Go to web page below. Part appears to be available $66.

http://www.searspartsdirect.com/partsdirect/part-number/3192157/0022/664?pathTaken=directMatch&filterPart=&pop=flush&prst=0&shdPart=

Yes, I saw that as well but when you try to order, it comes back as no longer being available. Thanks though.

Make sure the orifice in the valve isn't plugged.

I don't think it's plugged. The gas runs through but cannot be adjusted up or down and doesn't shut off. I swapped it out as MA0641 said above, and it fits in another location. THerefore, I'm ordering the other valve and just have a little less output - but still fine with me. Thanks!