Hey Fox,
good for you....
Might I suggest these to save some $$$$
I welded togeter a special swing for my special needs son and used these......
http://m.ebay.com/itm/380787146932?txnId=463569960025
They work well. My only complaint is I should have ordered 5 point harness for him. But i will be buying more if these for both the buggy and go kart.