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Bosch plugs



Good morning Audi lovers.  I have just bought a 89/Audi 90 Q, and it has Bosch "3 prong" 
spark plugs installed.  

Are these the regular plugs for the car??

Are they still available on the market ??,   can they be bought at an after market parts
store???  Is there some plug better???  Thanks for previous help.

Tony.