If you don't have one, any idea where i can get one!!!
Talk to this guy:
https://www.peterlorber.com/hasselblad
From memory he has good knowledge on underwater housings.
thanks Nick i have sent him an email.
Nauticam has one for the H4 and H5, the NA-H4D and NA-H5D. http://www.nauticam.com/product/na-h4d-housing/ (http://www.nauticam.com/product/na-h4d-housing/) I would directly talk with them as these housings are probably built to order. For example the H5D housing is still marked as "in development" at many dealer sites and is not listed on the Nauticam page, yet Henrik Sørensen used one in 2013: https://www.youtube.com/watch?v=S0Q34b8rrhs (https://www.youtube.com/watch?v=S0Q34b8rrhs)
thanks have made contact with them and they have given me a reasonable price. thanks again for all the help.