I have just bought two Z clamps to fit my spare wheel on my bonnet but they di not come with bolts, I hear the bolts are 1/2" BSF x 3 1/2", I have been to the couple of Engineering workshops here in Shetland and they tell me I cannot get anything like that on the Island, Haha, I am not an engineer but if I had the die and some steel bar I would make them myself but is there an equal to this size in modern day Bolts that I can buy on ebay or any other website of a sort?