Chevrolet did almost always use two different brands of wiper blades. Both Anco and Trico blades were used,
The arm sold by Chevrolet for 1949-1952 was "universal". If you bought an arm for replacement it was not bent for right or left side and we had a tool the corectly bent the arm. It was slightly bent so it would park correctly and lay flat horizontally with the windshiels lower rubber . Some replacment arms also had an addustable length ot the very end had movable to with a screw allowing the tip to swivel slightly.