Aldis telescope parts

Am just about to embark on having a couple of aldis prismatic lenses made. This is the optical glass prism that site ahead of the OG inside the front bell housing. The lens that you rotate in order to collimate the pictorial image to suit the MPI. Or simplified, the lens you rotate to zero left and right.

Not the brass housing (these are simplicity itself to make) but just the lens.

Before I ask for a bulkier quote, need to know of interest. Speak now or forever hold your peace!

Sorry Peter if i'm off topic but, where i can buy an aldis scope , plus rings ... i'm planning to build a n.I Mk III sniper..

Haven't got a bloody clue!