Whole bunch more photos I found for the 5/7 RAR M113A1 106mm modifications:
"61A"



The M113 family Interest Group | These are two M113 variants that were in use in Australian Army’s 5/7 RAR (Mech) in the 80-90s | Facebook


Army Aug 2002.pdf
"61B"

The M113 family Interest Group | The Tank museum at puckapunyal now has the 106 RCL configured M113A1 | Facebook
220411_fact_sheet_no5_puckapunyal_combined_arms_heritage_learning_centre_final.pdf
Some things to note:
- “61B” (61-Bravo) has been restored and is now in storage at the Puckapunyal Tank Museum, as per above photos and link. This PDF from an unknown date likely between March of 2022 and June of 2023 may imply that this M113 was restored specifically for exhibition at the now canceled Puckapunyal Combined Arms Heritage and Learning Centre (CAHLC). As such we don’t know what its current plans are.
- I have seen no further mention or imagery of “61C” (61-Charlie), which seems to only have appeared in 1997 or possibly 1994 and is posted in one of my prior comments. Oddly enough, many sources only claim that two vehicles were built, even though we have of course have three callsigns to count.
- Speaking of separate vehicles, it is also said that the (two?) converted vehicles were not equals. 61B and presumably 61C were mockups built by the RAEME workshops that lacked internal ammo stowage. They were functional vehicles, but not intended for testing purposes. It was 61A that was developed by either the DSTO or ATEA (conflicting sources but more likely the former) that was modified from standard APC configuration into a dedicated AT vehicle.
- As per this source from 2002, M40A1 recoilless rifles in Australian service were upgraded to M40A2 standard in 1971, which is a very minor change that includes some component swaps. This is the designation of the weapon fitted on the 2 or 3 modified M113s.
As a bonus, here are some additional photos I found regarding the M125A1 “82” with the MILAN missile (some are higher quality versions of ones I have sent here previously!):



















