You have the same fixtures and the same bulbs that I have in my rig. They have the BA15S base, NOT the BA9.
Since you don't want to solder, just plug and play, have a look at
these. I have used them in some of mine. If you want a brighter bulb, they are also available with 24 of the 5050 LEDs. Do an eBay search on "ba15s led warm white" and set the Sort to Price plus shipping lowest first.
I suggest you buy a couple first and try them to see if you like the color and brightness, before you buy a whole lot.
Sorry they are not the BA9, for some reason the BA15S base seems to cost more.