5x115mm = 5x4.53"
5x114.3mm = 5x4.50"
There have been some who have had studs break off or vibration issues, but I guess the vibration issues can be fixed through the use of hub-centric rings.
I'd use what the car's meant to use, 5x115mm, and in all my searching for rims, if I don't find one in 5x115mm, I'm no longer interested in that particular style ...
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Mine: '13 Mustang GT, Sterling Gray, 6-spd man, Recaros, Track Pk, 2.3L Whipple, 608 RWHP, 517 RWTQ
Fiancee's: '08 Mustang GT500, White/blue stripes, '13 TVS & injectors, FRPP twin-65mm TB, JLT 123mm CAI, 643 RWHP, 608 RWTQ
Previous: '07 Charger R/T AWD, heads/cam, a few other things. 355 AWHP, 370 AWTQ