Back EMF Diode On a Strike

I have a situation where I have to wire two different strikes in parallel and my manufacturer recommends I add a back EMF diode.

I have used them before, but I used to remember my techs saying they used to just make them in their trucks or on site with a bit of heat shrink, and a diode and a resistor.

I am not as savy and was looking to purchase them made up, but seeing the prices on them makes me want to reconsider busting out the soldering iron and the heat shrink, but not sure what parts I need or how to wire them.

My distributor recommended the HES Smart Pac at $37.00 a piece, which is a little pricy. What are the other options my fellow access control folks are using?

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