G'day Maurice,
If we are talking about the
Vintage Victa 18 125, then apparently, there are 2 different lengths. The image below, was taken from an item offering on eBay, which ended some time ago.
Also, check out this post ->
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/46849/my-new-victas-18.html as it should give you further insight, and for historical information on this Victa, look here ->
https://collectionswa.net.au/items/ba8e14d5-33ad-445f-9751-7d1666e984b0Hope this is of some assistance to you,
Regards,
mice_elf