I've decided it's time to step it up and install a c-notch in my truck, the small bolt in type although I'd be welding it in. I just don't know what type to get or where to get it? I've seen install pics of the round, half-circle style one from Suicidedoors.com. Are those a pretty good notch? Or should I look for a traditional style bolt in notch? Is one better than the other? Where else can I find notches?