...these are black anodized high strength (grade 10.9 and 12.9) metric screws with allen heads. I have them for both the front and the rear. I got them from Mcmaster-Carr, but I had to buy bags of 100.
If you want me to send you a set just PM me your address and I'll mail 'em to you.
In any event, the front screws are M5x12 and the rear one is M6x20.