DandC ............ (Dilation & Curettage ?) 
squirms .............. C'n'D would go together better 
......., anyway if you're after a 2nd oven shelf or replacement then google 'extendable oven shelves' and take your pick or just goto Betterware, i got 2 of them from there, they've been in my oven at CDA for 2 years, takes 5mins to fit each and they fit/slide perfectly etc ......... i no longer use the one provided.
www.betterware.co.uk/productdetails.aspx