I also vote for the clips on the front of the disk brake caliper. I happen to have come across the original front brake calipers of my 71' 280SL and they have these clips. Only difference is that they are flat, without the embossments and they are yellow anodized steel. I also worked on the front brakes of my wife's '67 230 fintail, and it has the same clips exactly similar to the ones shown on the picture. So I guess earlier Pagodas must have them too.