Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99-31-907843 found under Variable Resistor by Sensor Systems Inc. The National Stock Number assigned to this part is 5905009971396, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 99-31-907843.