I was helping Michael Van Der Veen find the front parking brake cable for his 300L convertible and most sources showed it being not available. They also had odd interchange with earlier vehicles.
We ended up buying the Raybestos BC92334 cable from Amazon, which they say does not fit the 1965 Chrysler, but instead 1966 and up. It was less than $23, and with free returns, low risk to try it out. Turns out it does fit the 1965 and the interchange that is used by many sources is wrong. I took it to him when I visited Australia last month and he was able to install it.
Hope this helps someone else.
Nick.