[6pack] Source for PVC sleeve ?

[Foster, Stan]

Throughout the TR6 there are various times where black PVC like sleeve
material is used to buffer the wiring. We see it for the wires coming through
the inner wing for the headlamps and we see it covering the metal tabs all
over the engine bay that secure the loom. Do we have a source for that black
PVC sleeve or any suggestions for a viable alternative ?

Stan