I don't recall those as white. Shelby used "Scotch Splices" on my GT 350. They are blue, and the ones up front were taped over.
Do you mean the Tie Wraps that hold the ammeter wiring to the export brace? They are made by Panduit, the wire covering (white plastic wrap) can be found at electrical suply stores.
My previous post was not very clear. The original connectors (4 of them) were white and were not taped. One of them broke and I could not find a white replacement, so now I have the 3 original white ones and 1new blue one.