Help Please!! Mid 1960s coronet window rubber

[rdj]

Hi everyone!

I have a mid 1960s coronet. They have alfab windows. 

Was on a roll with the glazing window rubber... First batch was perfect! Until the 2nd batch I was given was incorrect. Followed it up with Clark rubber and it seems their supplier says it is correct, even though upon measuring it is way too big, it slips straight out of the track, there just is no grab. 

This is the rubber I have been using: www.clarkrubber.com.au/products/43509-glazing-wedge-for-caravan-alfab
 I have also purchased a sample pack from vintage caravan spares however those rubbers do not do the job.

If anyone knows of a rubber that fits the profile I am after, I would greatly appreciate any tips!

This is one of the coronet windows. 

[sportsman 1]

I purchased rubber for my Alfab windows direct from Alfab in Heidelberg. The salesman said he had heaps of it up in the attic.

[rdj]

Thank you!! Much appreciated 😊