So far:
PLA (Several different ones, including the 64Cs Super PLA)
SID (Several, IE ARMSID, FPGA SID, BackSID, etc)
VIC-II (Kawari)
CIA (J-CIA64)
ROM's (EPROMs, Etc)
RAM (SRAM Modules and abundant replacements for original ICs)
8701 Clock chip (Several replacements)
6510 CPU (There is an adapter to add missing features to a plugged in 6502)
Logic ICs and other components are still made.
Amazing