I haven't used this brand but it gets good reviews and comes with an SCR and heatsink. I would not use the Thermocouple that comes with it though since it will not react very quick to air temp and give you big temp swings.
The kit is $ 40
For the PID kit, do a search on
Amazon for "(ITC-106VH + 40A SSR + White Heat Sink + K Probe)" for a better manual google "inkbird itc 100 pdf"
That manual has wiring instructions that will work with an electric smoker.
Use high temp rated wire for the heating elements and high temp connectors to the element, you can get them at appliance parts house.
For temp measurement I strongly recomend getting a temp sensor that is 3mm / 1/8" in diameter or smaller and long enough to have 2 inches or more exposed in the smoker.
It can be K type thermocouple or PT100, the PID can use various sensors.
This K type is 4" long
This PT100 is also 4"
It really depends on the PID but you may have better results doing an auto tune and then setting the temp at 200 F,
once the smoker gets up to temp, do another auto tune while the smoker is at 200 deg.
I do a lot of various temperature control at work and you would be amazed at the difference you will get using the right sized and proper placement of the temp probe.
PS, Don't run that smoker over 275 deg F. It's not designed to go higher.
EDITED but links still don't show ?