Check the listing for details. Heathkit Extender - Riser Board for HW SB-104A Transceivers (Smaller boards). Condition: New. Listed at 30.00 USD. Offering a circuit extender board for use with the Heathkit SB-104 or HW-104 Transceiver. This extender is for the minor, six conductor, boards. (Driver, PA, band filter, noise blanker.) This board is used to extend the smaller plug-in boards so they can be serviced and/or repaired. Note: It seems Heathkit never produced and extender for the smaller 104 boards but a few technicians have requested this board as custom made. One can see that there is an advantage to getting the smaller boards up and out of the cabinet for probing. TO ORDER MAKE OFFERS AND TO SEE OTHER ITEM OFFERED GO TO: https://www.ebay.com/str/sparko6079?_trksid=p2047675.l2563 NOTE: I can custom make almost any extender board. With basic information about the extender you need I can program the automated CNC machine I have to produce what you need. I do not charge extra for customizing a board or set of boards needed to service most radios and test equipment. With basic information from EBay buyers I produce a set to sell to them through EBay and then offer the same extenders to other buyers on EBay. If you have an idea for an extender board or extender board set you or others need please contact me so I can make up a design and offer it on EBay. TNX & 73 John WA1ESO