Welcome to the Forum. As indicated above by Mr. CPHo, what you have is a vintage 26" Weber. Yours is quite a Weathered Warrior (a term given to kettles with a patina from years of being exposed to the elements). Your kettle was originally black and was given the name "The Fleetwood" by Weber for marketing purposes. With it having plastic wheels with rubber treads will probably date it as being around 1970-1972. It is depicted on page 5 of this 1970 Weber catalog:
http://weberkettleclub.com/weber-catalogs/1971-Charcoal-Brochure.pdfI don't see a charcoal grate in any of your photos. The current model 26" charcoal and cooking grates will not fit your kettle. Vintage 26" kettles use a different size cooking and charcoal grate. Here are the part numbers for vintage 26" kettles that will fit yours:
cooking grate - #66910 (24.5”)
charcoal grate #66911
Weber does still carry both of these items (last I checked). If you attempt to order them, your biggest obstacle will be getting through to Weber Customer Service. They are still ramping up during the current Covid-19 crisis restrictions.
You can post a "looking for bowl vents" add in the Trading Post section of the Forum. That or find a inexpensive vintage kettle for sale on CL to use as a parts donor. The 26" kettles use the same size bowl vents and metal handles as a 22" kettle.