so i got some dark slides.
turns out they are 9x12 cm ones. fit a 4 x 5 but not the same as one for 4x5 film obviously. pain in the ass. didnt even realise until i got it in the changing bag and sopmething just wasnt feeling right.
you live and learn. so 4 of these probably for sale now. what a waste of time and money.
shall have to make sure i mention it on my videos and forewarn folks:)
frederick