which one of these straight filters works with headers?

I have used all three filters.
ph8a=large size
ph43=medium size
ph16=small size
All three worked fine on my 360 and i use the ph16 on my 318.
Check your clearance and use what you feel is the right one.

By the way i run dynomax headers on both my cuda and coronet with small block motors and do not use the 90 degree adapter.
My filters go right on the side of my motors and do not hit the headers.:glasses2: