This particular model Boston Acoustic 10″ woofer uses the RFK10 Boston. Other 10″ Boston woofers use the RFK10 Angle. Refoaming with the straight edge attach foam is much more difficult than using the flat or angle attach foams. This is what a successful Boston Refoam looks like. We reused the original dustcap because the customer requested it, but there are many other options. We have plain polyprop caps, Boston logo polyprop caps or the normal screen, felt or paper dustcaps