Quick question. My Blade just failed the WOF because the rear caliper is loose. I asked the guy why and he just said tighten the bolts....

I've since discovered one of the caliper bolts is missing... I'm thinking I'll just grab a stainless bolt in work and stick that in is there any reason to go to Toyota and fork out for the real McCoy? I guess if they have it in stock I'll do that.
Can anyone tell me what size the bolt is? I'd no equipment to measure the other one tonight and the missus needs the car for work tomorrow.
OEM no. 90015-AA102
Danke
