If you are looking to purchase synthetic head for your drums, both Remo and Evans have made charts of which heads should fit which type of drums. Please remember, with synthetic heads, it might not be an exact fit. Because of a lack of standardization between conga & bongo drums, synthetic heads may not fit certain brands/models. Please refer to the charts below.
Remo Conga & Bongo Head Chart PDF
Evans Conga & Bongo Head Chart PDF