Part 6135 (palm tree/Technic horn)

[Philippe Hurbain]

This picture show only four, but there is also 2536e at Bricklink.
So maybe one of them looks like this and is correct?

I have version a/b/d (edit: and c too). Basic geometry looks exactly the same except for longer base. I try to improve that.

And how about that partnumber, 2536? Where does it come from?

2536 PALM TRUNK
6135 PALM TRUNK W. CROSS