1969 Nova SS bucket seat attachment help please

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I am trying to order a pair of seat track extenders for the 1969 Nova SS with bucket seats that I just bought but the car is 2 weeks away from getting delivered. Does the front of the bucket seats attach to the floor brackets with the bolts going at a 45 degree angle or horizontal with the bolt head facing the front of the car or is attached with a stud and nut? I understand that the rear of the seat is attached with a bracket with a stud welded straight up and a nut. My 1970 Nova has a bench seat and the seat is attached with all 4 bolts going straight down into the bracket towards the floor like in a 1969 Camaro. Any help would be greatly appreciated.