For British/Canadian manufactured vehicles, using this type of web strap would be appropriate to attach the various external fittings such as tools. It is the same type of woven cotton (webbing) that was used on 1937 Pattern Web Equipment.
One of the easiest and most common Second War period straps that can be still found in quantity and are not overly expensive are the 1937 Pattern Web Supporting Straps.
It goes without saying that Canadian manufactured straps would have been found on Canadian manufactured vehicles and British straps on British vehicles. As well, new vehicles would have been supplied with un-Blancoed straps like these which I have photographed. Of course once a vehicle has been repainted or camouflaged, any web straps would most likely be the same colour as the vehicle.
US manufactured vehicles would have been supplied with US manufactured straps which are very different from the web straps I have illustrated here.