We can supply Keystone Electronics part# 781-B. Use the request quote form to request 781-B pirce and lead time. RANTLE EAST ELECTRONIC - ICRFQ.com is an independent stocking distributor of electronic components. With 5+ Million line items of available electronic components can ship in short lead-time, over 300 thousand part numbers of electronic components in stock for immediately delivery, which may include part number 781-B. The price and lead time for 781-B depending on the quantity required, availability and warehouse location. Contact us today and our sales representative will provide you price and delivery on Part# 781-B. We look forward to doing business with you.