Here you can find detailed describtions of the several Tracker conversions – but no 2F2-4…
http://www.faqs.org/docs/air/avtrakr.html

2F2-4 is mentioned in this list
http://www.marchfield.org/rouen08.html

Bu133201 was a S2F-1 version c/n 172
http://www.abpic.co.uk/photo/1071497/

This pic http://www.pbase.com/marauder61/image/55282369
shows c/n 193 – but this was Bu133222 :confused: