to the invention each of the fastening bases 6 shown here is fastened with a clamping action in one of the openings 4 which here have a square shape a wide variety of supporting structures or other structures or components can be fastened integrally or releasably on the fastening bases 6 for example in this illustrative embodiment the grips 18 are shown which are fastened with a clamping action on the carrier plate 2 by means of fastening bases 6 according to the invention furthermore in this illustrative embodiment the different fastening bases 6 also carry a wide variety of supporting structures e g the cross shaped uprights 13 the fir tree shaped uprights 14 the multi fingered uprights 15 and also the rod shaped uprights 16 the cross shaped fir tree shaped and multi fingered uprights 13 14 15 are each integrally formed on the corresponding fastening base 6 as can be seen in fig4 the rod shaped uprights 16 are screwed onto the respective fastening base 6 by means of in each case one of the expansion screws 12 some of the fastening bases 6 shown here carry a threaded bush 19 in their interior any other components can then be fastened on this threaded bush by screwing in preferred embodiments both the carrier plate 2 and the fastening bases 6 are expediently made from plastic the alternatives to this have already been mentioned at the outset.