It is simple physics, a larger AN grade bolt is much stronger than a smaller non-AN grade bolt. It is meant to be a one time fix, and largely worry free after that. Watch a few of the "elise toe link" failure videos out there, you will then want a beefy strong solution after viewing.
Storm titanium 2005 Elise with carbon fiber spoiler, BWR sway bar, BOE toe links, gPan2, LidBone, sector 111 wheel studs, Grey RAC Monolite wheels with toyo R1R, Team Dynamics 1.4 with Hoosier A6/R6s, Katana2 Supercharger, ECU with 265 flash. PPE headers w/decat, CEL angle eliminator, Silent touch catback, Rear Panel Eliminator, HKS intake, V2 fuel tank, Walbro255 fuel pump. HID lights.