Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 333-5961 PARTS KIT B1 found under Parts Kit Dental Operation And Treatment Unit by Fort Defiance Industries Inc. The National Stock Number assigned to this part is 6545013590432, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 333-5961 PARTS KIT B1.