pid heating element components replacements

i've seen this video:

and pull out this scheme:

I've found the components: BTA16, MOC3020.
But I was unable to find the "EL817 PHOTO COUPLER" component on my region.
there is any replacement for this component you guys can suggests me?

If you are not experienced with electronics you should start with less dangerous projects, and leave electrocution and burning your home for later.

Almost any opto coupler will do. Get the data sheet for the given part and compare the values with those of other parts. when Or simply assume that the output has to drive only 5V and 5mA.

Most critical is the allowed voltage between input and output (mains!) and your circuit, that also depends on proper wiring. The same for the opto triac at the output.