308 bolt size?

[sire01TMK]

Hi,
I have a th350 box with a 308 turbo pattern red block from a hx/hz statesman. They are going into my 84 vk but I am missing the bolts that bolt the box to the block, what size are these bolts. Are they 3/8" unc x 1 1/2"?

[VBRED]

Mate I am not sure but I just bought the genuine holden ones from GMH. Was uunder $10.