Britax B Dual- question about car seat adaptors in top

[LaTristesse]

So I have a B Dual, I think 2010 model. I bought it 2nd hand.

I want to put my newborn in her Britax car seat in the top position facing me, and then her brother in the bottom seat facing forward. I understand you can buy some adaptors which raise up the top position (car seat) so he gets a better view rather than just staring at her feet, but when I called a retailer to order these they've sent what appears to be an adaptor frame for moving the bottom seat backwards.

Can anyone tell me if what I want exists? What it's called (so I don't order the wrong thing again), and where I might be able to get it?

Thanks

I didnt know you could get an adaptor frame for moving the bottom seat backwards! I am intrigued. Is it the lower car seat adaptor an L shaped piece of metal with sockets?
What you need are these. I have no idea what they are called though. I have Googled and I cant see a picture. They come both in the box with the B-Dual and also in the car seat boxes. I had two sets once upon a time.

What they've sent you is the lower carseat adapter I think. Is this it?

Marvellous Tiggy thanks! I'd spotted those on eBay already so will get bidding now I know that's the right thing!

Can't see your link on my phone ItsMy but will check later on PC.

Thank you both for your replies!

Yes ItsMy, that is what I've received - half the price though! I'll send it back and get hold of those others.
Thanks ladies...