Welcome to TBN. /forums/images/graemlins/smile.gif
I have the quick coupler on my B2910. The same setup will fit your B7800 and 402 FEL.
Check out the this thread. Quick Coupler
The Quick Coupler is cheap compared to the Forks.
Hope you will be sitting down when you get the price. /forums/images/graemlins/shocked.gif