BOSE 501 Series II Speakers - Owner's Manual User's Guide - Setup Install Connect Instructions - YouTube
Amazon.com: Springfield Speaker 2 Speaker Foam Surround Repair Kit - 2 Speaker Kit - Compatible with Bose 501 Series I, Series II Speakers - 10 Inch : Electronics
BOSE 501 SERIES III 3 Replacement Suspension for Third Serious Edge Foam Woofer | eBay
Pair BOSE 501 Series II Floor Speakers w Refoamed Woofers Sound GREAT! | eBay