Haha I just changed my lower control arms out (traded my 20-yr-old stockers for some 10-yr-old stockers with better rubber until I can lift 'er) and know what you're going through.
I found that 9/16" x 4" long GRADE 8 hardware works fine - the OE bolts (M14) are 14mm diameter (nominal) but acually mic out about 13.8mm just under the head of the bolt, and 12.8 after it necks down (wierd). 14mm = 0.5511", 9/16 = 0.5626 so the 9/16" should work for you.
Or plan B (which is what I did because I didn't think to try 9/16" until after I already had these on order) is to click over to
www.mcmaster.com and order up part number 91310A796, which is a pack of 5, Class 10.9, Black Oxide M14 x 2.0 (dia x thread) x 100mm long.
If you want you can order 2 packs of 98040A108 which are (qty 5 per pack) 27mm OD, 14mm ID flat washers. I used them to help spread out the clamping force a little but you probably don't have to.
Finally you'll need 1 pack of 99899A231 which are M14x2, Class 10, blue oxide coated nuts. One pack = 5 nuts. Total = $30 with a bolt , washers and a nut left over. Not cheap but I know it's good hardware and since McMaster ships 98% of their stuff out of stock, it got here in 1 day (PA). You might be 2 days in IN but still quick. You could always wire wheel up your old bolts, but for a few bucks it's worth knowing that you have good hardware installed. And, the bolt diameter is slightly larger than the stock 12.8mm throughout the length of it for less play between the bolt and the bushing.
And all of those are 22 mm head, so get yourself a 22mm socket and wrench. Anti-sieze the entire bolt, tighten to 133 ft-lb and you're good to go!