[tifosiman]

Actually, you can cut the section of the 931 header panel out that has the four vents in it (so you have a long rectangular piece), then cut the same sort of rectangle in the 951 header panel and graft that piece in there. You'll have to do a little finish work to make it look correct, but then the vents, the curves of the openings, and the vent supports will be correct-looking. There was a guy on another forum that did this and it looked good.