Hello Joe,
Sorry that the manual of BP-VG3090FE is not available yet.
It can be downloaded next week.
About the dimension(LxWxH) of the water block is 239.1x121.9x23.2 MM.
From the picture of 3090FE, you can see the orientation of piping.
https://shop.bitspower.com/index.php?
route=product/product&product_id=7902&search=3090F
Yes, there is a PCI slot replacement goes with the water block.
Any question, feel free to contact us.