Replacing a 20 year old Dunlopillo Diamond zip and link mattress

We want to replace a 20+year old Dunlopillo Diamond zip and link king sized mattress. The label on it says luxurious latex interior, no turn, hypo allergenic, long lasting support, contours to your body, self ventilating, silent in use. It is 15-16cms in depth and 6' 6" long. My husband has always found it to be very comfortable - he is about 12 stone in weight. We want to keep the original sprung wooden slat base. Can you recommend a mattress please?