AFAIK there is only one clip supplied...
the screws are very small by neccesity ... I think the problems happen when you use the screws to tighten down/torque the clip to the body and they can strip out.
I believe the retaining clips by design don't fit snug so they are torqued down to keep pressure on the screws and minimize the screws from coming loose. :shrug:
(Some people bend the retaining clips before installing so they fit better - but I believe this defeats the purpose)
The way I install them it is to use needle nose pliers to clamp the 2 retaining clips together while tightening the screws (with a very drop of loctite on the threads)...
I have never had a problem with the fit or screws stripping - and the clips work great. (ie. don't use the screws to pull/torque/tension the two retaining clips together - use the needle nose pliers)