1967 Sebring wining tires Firestones or Goodyears

Trying to finish my Sebring winning Ford MKIV. Does anyone know difinitively what tires the MKIV used during the race? Several sites claim they were Firestones. I have picture that show Goodyears were used in practice and the pictures of the car in action appear to have blue line tires (meaning Goodyears) also Bruce McLaren was under contract to Goodyear.

Keith