Yup, aluminium here https://www.carbuildersolutions.com/uk/hoses-and-clips-aluminium-joiners-and-reducers
or brass https://www.carbuildersolutions.com/uk/brass-joiners-reducers-and-tees-brass-t-pieces
That's where I got my alu dimpled sheet from too. And my fan switch alu tee piece for the electric fan mod - a handy source of parts actually!
Cheers for that, I'll have to measure up the T piece and see if they have one to suit :)
Might as well get the dimpled hestshield material there too, rather than paying through the nose for a factory shield!