[Aussie Mike]

Don't waste your money Ben. Re use the factory bolts if you have them. Or Just buy some stainless steel alen head cap screws flat washers and lock washers. The cap screws have a small head diameter which makes them good for getting into tight spots between the headers. They will be plenty strong enough. Probably about $10 for the whole lot from my local bolt guy.

Use spring washers and then flat washers to avoid the spring washer digging into the ceramic coating on your headers. Locktite will work too but may suffer with the heat long term.

Cheers