Space saver spare size?

[patch99]

Can anyone tell me what the size of the space saver space is for a 1987 Grand National?

Thanks!

 

[Benched]

T155/80D16

 

[patch99]

I contacted a used parts dealer he says the one he has is T155/90D16. Should I purchase this or does anyone know where I can get a T155/80D16 size. Thanks!