How to find gasket part numbers?

I have replaced a number of head gaskets in 3rd gens now and have always ordered the toyota overhaut kit that includes the head gasket as well as all other engine gaskets. I will be doing a head gasket on a friends car and he wants to use a felpro head gasket. Considering that I dont want to pay for the entire kit but rather only thet necessary gaskets separately(many in the kit really are not necessary). I have seen people before on the forum post diagrams that showed the motor disassembled and each gasket and its part number. What is the easiest way to search for these part numbers? Thanks in advance