After doing a few rebuilds this year, I'm over buying head bolts. Especially when I mix and match XU9J4 heads with XU10J4 blocks. I've seen ARP studs for XU10J4 on a web site, but strangely enough, ARP don't list a part number. I decided to do some research. The Dodge 5.9 kit 247-5403 has the same bolt as an XU10J4. The kit comes with 14 studs & nuts (and some other bolts you don't need). For an XU9J4 head you need a longer bolt over the water pump. For this you need just a single AU6.195-2LB.   In the pic are standard XU9DTE and XU10J4 head bolts for comparison.   I'm building three engines at the moment, so I bought two Dodge kits and three single long studs. Even buying from a dealer in the US and including shipping, they were far cheaper than local quotes and those advertised on another website.   The only caveat, is that you need to turn down the OD of the nuts, so they fit in the head. Otherwise, I'm stoked.