Roll Bar Side Seal, Early Side Seals are Different Options

[houvins]

Am a newbie, so not sure if this is the right place to get this question answered.

Have a '71 914-4 (MFG Oct '70) and am attempting to replace the roll bar side seals, the vertical seals at the back of the window. Ordered the replacement parts and while they fit, the profile is significantly different from those being replaced. The original has an "L" shaped void in the center which allowed the window to fit. The replacement parts have a small "o" shaped void with a much heaver rubber profile that prevents the window from seating when fully raised. Have been told the older parts were replaceable by this new part, but it hasn't worked for me yet. Several years ago an old catalogue listed both parts, but no longer.

Is there a source for the earlier profile seals?

If not, is there a lix to make this new profile accept the window in the fully raised position?