Sliding window size

[vwt3_haubaproject]

Ok! Sliding window topic. Ive read a few posts here on TS but could not find the ones regarding different sizes.

I have a LHD T3 from -89.

Now i have clear normal glass, non sliding.

I found sliding windows on JustKampers but their size doesnt seem to fit measurements on my window frames. But im not sure where to make the correct measurement, see pictures below.

Where am i supposed to measure? The outer or inner edge of the seal? Or in between the outer and inner edge of the seal?

SLIDING WINDOW Driver side
https://www.justkampers.com/middle-sliding-window-nearside-left-vw-t25-lhd-with-seal.html

JustKamper 1073.5mm x 419mm.

SLIDING WINDOW Sliding door side
https://www.justkampers.com/middle-sliding-window-...-door.html

JustKamper Size: 1043.5mm x 419mm

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VW T3
2.1l DJ WBX 112HP
65k miles
97% Rust free
Not driven between 2004-2019