Salt Pork Substitution

bacon
or
ham
or
pancetta can be substituted for salt pork.

Pancetta Substitution

equal parts prosciutto and salt pork
or
unsmoked lean bacon
or
bacon (blanched in boiling water for a couple of minutes to tone down the smoky flavor)
or 
prosciutto can be substituted for pancetta.

Irish Bacon Substitution

Canadian bacon
or
pancetta
regular bacon (blanch first to remove smoky flavor) can be substituted for irish bacon.

Fatback Substitution

bacon (blanch before using; good for barding or lining terrine pans)
or
salt pork (blanch first) can be substituted for fatback.

Canadian Bacon Substitution

Irish bacon
or
ham
or
pancetta
or
bacon (not as lean) can be substituted for Canadian Bacon.

Imitation Bacon Bit Substitution

bacon (fry bacon until crisp, then crumble into small pieces)
or
turkey bacon (crumbled) can be substituted for imitation bacon bits.

Bacon Substitution

turkey bacon (less fat, doesn’t shrink as much as regular bacon)
or
smoked ham
or
Canadian bacon (leaner)
or
pancetta
or
salt pork (in sauces)
or
smoked sausage
or
ham
or
fatback (for barding)  can be substituted for bacon.