Wow... That is expensive to say the least... Is there a size in between a 1U and 2U? This was the riser card I was looking at...
https://www.ebay.com/itm/PCI-E-X8-P...131744?hash=item1ee56ccd20:g:RHkAAOSwbbRbRJ4I
https://www.ebay.com/itm/PCI-E-X8-P...131744?hash=item1ee56ccd20:g:RHkAAOSwbbRbRJ4I