It is suggested to replace your pickups as a set, however, it is not necessary. Humbucking upgrade for 4000 series basses adds output and hum-canceling.
We use two ceramic magnets and special windings to achieve this boost. Powered by SixBit's eCommerce Solution. The item "SEYMOUR DUNCAN SRB-1 Humbucker Pickup Set for RICKENBACKER 4003 Bass Guitar" is in sale since Thursday, July 19, 2018. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Guitar Parts\Pickups".The seller is "myguitarsupply" and is located in Augusta, Georgia. This item can be shipped to United States, Canada, United Kingdom, China, Mexico, Germany, Japan, Brazil, France, Australia, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Bahamas, Israel, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Turks and caicos islands, Bangladesh, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Liechtenstein, Luxembourg, Monaco, Macao, Martinique, Nicaragua, Peru, Pakistan, Paraguay, Viet nam, Uruguay.