Frame extenders/clip ons/knock ons - Argh!, please help!

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Hi All,

I need to replace a rotten wooden window, and have acquired a used frame to do the job. As the replacement frame is slightly smaller than the existing one I need to make up the gap using a frame extender, but when I went to B&Q I discovered that they have 2 different profiles, but both have the same barcode/product number!

This is the profile of the window I will be installing:
B5XxXecZ0I0LUrrvY00S09EBpvI_bqbMpAyz1vviBJ41_zps36ef95ad.jpg

This is the first extender:
Hb-8b3YpWmQlHXn94qkWBoKxMDcP_CMG_gbVzDb3WYw1_zpsab392325.jpg

And here's the second:
gEcfo_kx7tgPpUgkhDSYb0cd3OjacvvLSJIj6fiUmlE1_zps1e2b4c63.jpg


Now, by my way of thinking the second extender is the best - it has a box profile, so is stronger. and it also seems to be a better fit - any thoughts?

My next question is how to attach the extender to the frame - do I just silicon it on, then the frame fixings will pull it all together?

Thanks for any help!
 
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Go for the second option, screw it on with 30mm self tappers. The add-on normally unclips when the drill hits it. Pre-drilling thr frame first will also minimise the add on unclipping
 
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Also, run a bead of silicone along the frame where the add on will be going
 
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