You can get those plates, I'm sure speedway sells them & I am pretty sure Harbor Freight & Northern Tool sell them fairly priced.. You can build your own smoke preasureizer my favorite way "CHEAP"
1. 12 volt soccer ball pump.....$10 -$15 bucks
2. clean 1 gallon paint can
3.handfull of steel wool
4. couple 5/16 brass hose barbs
5 3-4 feet 5/16 hose
6. a diesel glow plug
7. turn signal flasher
8.14 guage wire & alligator clips
9.transmission fluid or fog juice [ cheap @ any party store]
install the house barbs into the upper edge of the paint can "solder,braze weld,etc."... obtain a nut or fitting for your glow plug to screw into and weld.braze or solder this nut to the paint can approximatley 2-3 inches up from the bottom edge of the can. install your glow plug and wire it up using the turn signal flasher to blink it on & off... add the steel wool to the paint can,fill it to about 2 inches above the glow plug..sprinkle your smoke juice over the steel wool ,install the paint can lid, hook the soccer ball pump to a hose barb,connect your pump & glow plug leads to a 12 volt power source and you should start getting preasurized smoke from the other hose barb..
you can use the hose to connect to vacume hose fittings and vacume hoses to find leaks. Denny can probally draw up a wiring diagram as I don't nave any way to do it..... Now for the lawyers.... If you burn your car,garage,house or yourself up.it's your own dang fault so don't come lookin for me............

But this does work,I've seen it in action..it's not as effective as the commercial units costing $1,100 bucks,but it is effective. you absolutley gotta be sure and use a low preasure pump as you don't wanna blow the lid.. off your can..........