I checked my panels while looking up the channel specs. My panels are 1/8" thick but then have 1/8" strips added to one side along the top and bottom edges. However as Phil says there is variations
The other thought I had was if you used the Speanur stuff is to make a 4mm spacer for the window frame.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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