Most folk have used heat shrink sleeve on them.
That said, I belive that was one of the sticking points during Ash's IVA
I guess you wouldn't go far wrong if you popped into an electrical store & picked up some cable sleeves.
Forget what they are called .... The plasic sleeves that are usually found on armoured cable where it enters a equipment enclosure.
Should be able to find one in a size that is a nice snug fit
Your car is looking great, looking forward to seeing it in the flesh