Matt: On the inlet trumpets, yes, there should be four. They're on a small moulding attached to the body and I doubt if they've broken often enough for anyone to have made repro parts.
You may be better to cobble up a replacement with something like the eyelets used on the guide end of some Scalex lead wires, or the sleeves of very small rivets if you can get them off the pins without damage. The alternative, of course, is to use short lengths of tube, painted silver or aluminium.
Rob J