Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X1973 found under Transformer by Basf Catalysts Llc. The National Stock Number assigned to this part is 5950000909474, and the Federal Supply Class is 5950 Coils And Transformers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like X1973.