Reporting back in - this part http://www.appliancepartspros.com/ge-deflector-oven-kit-wb49x27927-ap6040147.html plus a new igniter worked like a charm. like micnden below said, the holes do need to be tapped.. I just dug through my bucket of old screws and found a sacrificial phillips head that did the trick, rather than strip out the ones that were in the oven, which aren't very forgiving.I had the same concern, to the point that I noticed that there were some extra holes in the sides of the pictured item on appliance pro's website for where the bake deflectors attach. Also, the PDF that bigbuck attached lists the models as well as the serial numbers of SV– TG (Sept. 2011 – Oct. 2016). My serial number for my CGS990SET4SS begins with SD, which does not fall into the range specified. However, upon further review I went ahead and ordered the parts, noting that the extra holes were offset from center in the same directions, and 2 of the 4 appeared to line up. If it doesn't work out, appliance pro's will take it back free of charge (minus my shipping, I'm guessing), so I'm not too worried.. heck, for $22 and change, it's worth the risk. I'll report back on proper fit.