As stated, a starter which fits the 160 and 157 teeth small block 221/260/289/302 and 136 teeth 3.03 170/200 should fit the Aussie engine.
Maybee I'm missing something, but every time this discussion comes up, someone seams to get confused that a starter which works on a 184 teeth FE can also work on a 136 teeth 3.03 small six or indeed a 157 or 160 teeth Aussie block. The 164 teeth flexplate is specific to later low mount 3.3's and some US 250's, some 300's, and a lot of M code 351 Clevelands, and its starter is in a different position to suit the huge flexplate. Some starters have different thickness seperator plates, so there are a few things which can go wrong. 28 and 50 oz unbalance factors for V8 flywheels and the 2.75 or 3.0" pilot differences between US 200'S and 250's and pre and post 1971 Aussie i6's, plus metric bolts after 1985 all make it hard to be absolute about I6 flywheels and flexplates.
To elaborate. A compact Aussie 2011 FG Falcon 4.0 DOHC six starter fits an Aussie 1966 XR Falcon 200 block, because they both have a 160 teeth flexplate. Neutral balance 157 teeth flexplates from Aussie 250's or 240 or 4.9/300 bix sixes were just a V8 inspired replacement for running an American C4 transmission.
All Borg Warner/BTR manual and Borg Warner/BTR/Ion/ZF automatic i6 Aussie engines from 1966 to 2011 run the same ring gear. Aussie market C4's for sixes from 1971 to 1980 ran 157 teeth. No alloy heads ever came with C4's, so a 157 teeth flexplate or flywheel is pre alloyhead. Before 1971, all 188/200/221 I6 flywheels were 2.75" pitch centre. When the tall deck 200 and Aussie 1v and 2v 250 arrived in the 1971 XY Falcon, it was all V8 style 3.00" pitch with six 7/16 bolts. After 1985, all unleaded gasoline X-flows got metric bolts, and the OHC and DOHC and 1986 to 1992 OHV X-Flows all ran the same metric bolted flexplate.
Aussie variations on the C4 for the V8 Windsors and Clevelands were American made and stamped C9 (157 teeth) and or C10 (164 teeth) and used until 1983, there were US FMX's too which ran 164 teeth. They were all 28 oz unbalance.
The FE starter for its 184 teeth flywheel has the same pitch as the 136, 157, 160 flywheels.
164 teeth starters are in a different position to the 157 teeth, but the pitches are all the same. If you divide the number of teeth by the circumference, you get a constant number, and as long as its within three teeth, you'll find it fits.