These are three pair of guide brackets from late type scissors regulators doors. They are what you need to install the current triangle window seal on early cars.
The early brackets had a tab that inserted into the seal. It caused leaks into the door.
Both Porsche ans aftermarket seal do not have a slot for the old bracket. You either need to modify your old bracket of bolt on a pair of these.
They have been stripped and powder coated.
Three pair available for $27.50 a pair.