LS 430 A Lovely thing

From our 2017 RX 450h genuine Lexus boot liner in excellent condition. Collection from SO30 2EB Botley £40

Hi all, My LS 430 is a 2000, full history and only 93k on the clock, its a lovely thing. Whilst changing the cam belts and water pump I noticed the radiator was looking a bit shot so I ordered a new one. What arrived was identical to the old one except for the fact that it doesn’t have the take off for the expansion tank. Green circle in the picture. Has anyone else had this problem and is there are work around? For example can you use the radiator cap vent pipe? The only other thing Ive not been able to sort so far is the mystery of the self opening sunroof. It works great, opens and closes easily but every now and again it will decide that it wants to open, all on its own. I’ll be driving along and then, hello outdoors... .... the roof is open. It closes again on the button but because I have no idea what is causing I’ve removed the fuse for now. Anyone know what it might be doing this? Thanks for any and all help and suggestions.

Ah the green circle isn’t on the picture... well top right of this pic.

The return on the old rad is where the green circle is on the picture.

I tried to replace my leaking radiator on my 2000 LS 430 but the new one arrived without the return to the expansion bottle on the left of the rad. It’s identical in every other way. Anyone else had this and is there a workaround?