I have a 117 and it is all orange. Thinking main difference between the 2 models has something to do with the ignition/coil/whatever. When I purchased the saw in the mid 80's, I recall being told that by the seller when I asked what justified the significant price increase between the 2 models.
I think that you just need to use the HK21c.
That carb uses RK-34K repair kit which is a complete rebuild kit with screen, gaskets, diaphragm, welch plug, etc or the DH-1HK kit which is just the gasket and diaphragms.