KZ900 Exhaust mounting bolt size?

I'm switching out the 4 in 2 Jardine exhausts on my KZ900 with a set of repros from Z1parts. The mounting bushings from the 4 in 2s are still good so all I need are the two mounting bolts. Instead of paying 21 bucks for them was hoping to find a couple suitable ones at the hardware store. Parts list shows these are "92003-180 Bolt, Hex Head, 10X104" I can get the diameter from my 4 in 2 bolts, all I need is the length of the stock bolts. If anyone knows or doesn't mind measuring theirs I'd appreciate it.

10mm x 104mm