See here: https://www.marlincrawler.com/suspension/rclt/rclt-hd
Release group 1:
2005+ Tacoma
Release group 2:
2003+ 4Runner
Lexus GX470
FJ Cruiser
Release group 3:
1995-04 Tacoma
1996-02 4Runner
Release groups 1 and 2 are getting very close, should be releasing this winter, hopefully around February (watch two of the test vehicles running in in KOH). Group 3 will take a different design that is a ways off.