Perhaps some here find this cool.
I found this while taking a look at a mk2 under restoration somewhere in Spain.
The mechanic wanted to use original looking round type cable holders . These are one-piece made from hardboard. These things are almost impossible to use with modern silicon cables because you need to pass the cable through the holes.
The garage has a good 3D printer and they reproduced them accurately.their design is really smart: they are not in one piece, but in three pieces that clip together firmly, so you you do not need to insert the cables and can use modern cables.
They never thought about selling them but they gave me two for free for my XK.