Brandrup Iso top V fitted in a T5 Beach

[Big Bloke]

Has anybody fitted the Brandrup Iso top V into the T5 Beach roof, specifically the Iso top V 100 701 071 and if so did it fit OK?
I've seen loads about the mark 4 fitted into the T5 Beach but it seems that the mark 4 is no longer available, I've looked everywhere for one.