Solidor power bar coupler

[FrankM45]

Hi, about to install a Solidor door with 2 half length side panels. There are 2 aluminium couplers supplied with plastic trims to cover the joints - 2 flat & 2 box section - but I’m questioning which way round the trims go - is it the box section on the inside or outside?
(The question could also be which way round does the coupler go as that determines which side the trims can fit).

It looks like the box section goes on the outside but it would be good to clarify before starting.

Many thanks for any advice.

 

[Ian H]

Anything like these:

https://www.diynot.com/diy/threads/fitting-aluminium-couplers-to-rehau-frames.519079/

 

[Upvccollect]

Box/bolster bar to the inside,pretty cover to the outside,looks odd but that’s the way they say you do it