If it is a stock spring plate the bolts are not replaceable. Im 90% sure of this. Ive got a plate sitting in my truck right now when I get a chance Ill double check.
I'm replacing all my spring plates on my CJ, most of the plates seem to have the sway bar link stud weilded in, I think the warrior plates with skid protection are the only ones I have seen that are removable.
Front plates sell for average $18-30 each according to what brand or if you want skid protection on them. The cheapest I think I have seen so far are at http://www.rigidsteel.com/.
Hope this helps.
Nth 6"LA lift, TT, Stinger/Slider Combo, Superwinch EPI9000, Durango Front & Rear, ORF Tire Carrier, Independent Locker Mod, 15x8 Crager Locks, 35" MT MTZ,Rock Hard Parts trail Cage, AEM Dry Flow, Viking Fastback Top.