Numbers for the ’58 knobs: Choke 203602 – ebay $20
Low speed – 277873 replaced by 277879 – ebay $15
High speed – Marineengine – 277874 – $10 + shipping bringing it close to $20.
As is often the case on ebay, many sellers list items with the wrong part numbers/years/application but at least you have a visual of what they should like and you can compare. If originality isn’t an issue maybe someone has a set from another year for cheaper.
One seller on ebay has the complete set for $32 and free shipping. He has it listed as 1956 but he’s wrong, they’re ’58 style. It also says for 5.5 but they’re the same size for the 7.5. He also only has 98% feedback with comments about slow shipping so buyer beware. eBay item number: 335254242466 – https://tinyurl.com/2hdw6nbw
