Hey Blue, this assy will be difficult to find, however, it can be assembled using its "sub-components". This is the parts listing for A-23293 from IPDB, quantities needed and where the parts may be purchased. (PBL-Pinball Life, M-Marco, PSPA-Pinball Spare Parts Australia) They may be available from others, as well. I didn't list suppliers of common washers, screws, nuts et.
I edited the list to eliminate the cables and parts that make up the things like the solenoid coil. Assy drawings can also be found on IPDB.

806 .2 A-23293 1 bank drop target assy
807 ..3 03-8750 tgt-flush 1 PBL
808 ..3 A-14617 brkt & post assy 1 M
809 ..3 4408-01119-01 nut 8-32 esna/ntm 4
810 ..3 A-11397 drop tgt stop bkt 1 PBL
811 ..3 AE1-26-1200 coil assy 1 PBL
819 ..3 01-8413 brkt coil mtg 1 PBL
820 ..3 03-7066-4 tubing-coil 1 M
821 ..3 A-11388-2 plunger & reset plate assy 1 M
824 ...4 4410-01132-01 nut 10-32 esna/ntm 1
825 ..3 4700-00072-00 fw .265X.500X.032 4
826 ..3 10-392 spring-extension 1 M
827 ..3 20-8712-25 e ring 1/4 shaft 2
828 ..3 01-10183 brkt switch 1 PSPA
829 ..3 4006-01003-04 ms 6-32X1/4 p-ph-s 6
830 ..3 4010-01025-14 ms 10-32X7/8 p-rh 1
831 ..3 10-433 spring-extension 1 M
832 ..3 5070-09054-00 diode-1N4004 1.0a 1
833 ..3 5647-12693-31 switch sub mini micro 1 PBL
834 ..3 01-8600 insulator 1 M
835 ..3 4002-01105-10 ms 2-56x5/8 p-ph-s 2
836 ..3 A-15821 armature sub assy 1 M
837 ..3 A-14913 frame & eyelet assy 1 M
840 ..3 03-8630 guide actuator 1 M
841 ..3 4700-00003-00 fw .125X.281X.032 1
842 ..3 01-8240 plate-nut #2-56 1 M
843 ..3 01-8647-L actuator 1 M
844 ..3 10-363 spring-extension 1 M
845 ..3 SM1-26-600 coil assy 1 M
852 ..3 4008-01021-06 ms 8-32X3/8 p-rh-brass 1
853 ..3 4700-00089-00 fw .172X.437X.062 brass 1
854 ..3 4701-00003-00 lw #8 split 1

Wally