When I bought my 1958 TR3A brand new 55 years ago, I paid the S-T dealer $15.00 extra to install the optional windscreen washer bottle. It had (and still has) the name Trafalgar moulded onto the outside of the polyethylene bottle. The knob on the dash also reads Trafalgar. Because the bottle was turning a bit yellow with age, I bought a similar bottle from one of the big TR parts suppliers since they are also used for the overflow bottle for the rad of a TR4. At TRA, I was docked a part of a point because, while the bottle was shiny, clean and new, it didn't have the name Trafalgar moulded on the outside. Since then I put back the original yellowish one and all is well. If you're not into originality for the concours judges, use the overflow bottle. The lids are also available separately. Or you could buy a Tudor washer bottle and knob and them you would have a fully matched set - providing that the Tudor washer was also a TR4 item.