MGB Front Suspension Rebound Distance Piece Three Bolter

While revamping the front suspension on the MGB, I found this Previous Owner Hack:

 

MGB Front Suspension Rebound Distance Piece Three Bolter wait ...what?

I *think* that's suppossed to be #17 in this compleatly hand drawn and definately not stolen from the web drawing:

Totally hand drawn

So: please leave a comment if you know why the heck the PO may have done this Three Bolt Hack. It's either to do with the lowered ride height or the installed-and-then-half-removed-before-I-got-it-tube-shock-converstion. Rumor has it this was an Autocross car before I adopted her.

 

So: please leave any clues in the comments!!!