Will a st8a oil filter fit a 5.4 Triton?

Yes, a ST8A oil filter will fit a 5.4 Triton engine. The ST8A is compatible with a variety of Ford engines, including those in the 5.4-liter Triton V8 family. However, it's always a good idea to double-check the specific application and consult your owner's manual or a parts professional for confirmation before purchasing.