Once I get the whole conversion done and know exactly what castor I need, my plan is to make my own bolts up. Like aidanel said, solid shaft with tread.

Also looking into bigger better rose joints, for the testing and mocking up phase these will have to do.

I have done a similar conversion on our Escort Mk1 race car, so far so good, it holds up, going to perfect it with the ute and then make the changes to the escort as it will be gathering dust for the next 20 months.