May be the vintage car people might know. It is similar to what I remember some old cars used to have. Later they had a moulded plasticy/leather sort of material. There are a number of suppliers of aluminium extrusion in the Yellow Pages this guy says he'll source it for you worth a try.
Alsun Aluminium Pty Ltd
If You Can't Find It, Let Us Source It. Brisbane & Sunshine Coast.
Alsun Aluminium Pty Ltd
If You Can't Find It, Let Us Source It. Brisbane & Sunshine Coast.