https://imgur.com/J6m643k
I'm still not sure what these 2 caps do, but they are ONLY on the version with the 12 inch CRT, not the 10, so I assume it has to do with making the scan wider.
As mentioned, adjusting the width coil seemed to have no effect, not sure why, I doubt that it's open, but who knows.
I have 2 new caps ordered, mouser # 505-FKP1220/2000/10 , will take a close look at coil when I put them in.
edit...
a pic of the old caps from when I had the FBT out of the set.
https://imgur.com/qw1tylZ