Go straight to the source mate.
Economy Bolts will sort you out. Cheaper and they will have what you need.
Don't stuff around with retailers who'll hike up the price of products that are used in industry everyday.
There's more to a thread than imperial & metric.
Thread pitch, thread coarseness, single or double start etc.
Economy Bolts, Moorabbin
45 Capella Crescent, Moorabbin VIC 3189
(03) 9555 865
www.economybolts.com.au/