Hiya, you can still get Look Delta red cleats, such as these although I suspect the word 'compatible' is code for 'non-genuine'.
http://www.ebay.co.uk/itm/1-Pair-Red-LO ... xy-W9SO8AZ
I've had a look at all my old pedals and compared to newer models (PP56, PP76, PP226) and to be honest can't...