GBU648E*S GBU648E*S (GBU648E-S) Base Rack for S2T/S2, 8 Slots (Up to 5 station bus slots). $640.00 | I-PLCC28-32 I-PLCC28-32 Package adapter for PLCC-28 and PLCC-32 chips $89.95 | TDA121-BS TDA121-BS 1 Analog Output, 0 - 20 ma/0 - 5 Vdc, 12 bit, Fits inside T1-40 $238.00 |