If you look at past posts you will see others who have discussed this matter. i have herd of wobberly bolts too, but i would not recomend them, get a set with a PCD of 4x98 and no more than 13 x 5.5j you could push to 6 if you invest in some wheel spacers.
Look for cinq alloys on ebay or any fiat or lancia / alfa alloys with 4 studs would do, as long as they are 12-13''
theres loads of modern alloys avalible for the fiat cinq online. but watch out for the new bolts as they offern have the wrong size thred on them. you mite have to buy longer ones or recycle your old ones.
Hope i have helped a little, but as i said search the fourum... i think some1 is selling some cinq alloys right now! 60quid!!!