[Grubby]

Reread the ERA manual. A spacer is not always needed. That is to cure a specific situation.

"Most clutch pressure plates won't require the spacer
shown below. Some, however, have tall fingers that move
the fork connection forward. The spacer moves the slave
assembly forward and inward, correcting the alignment.
If the alignment is still off, the corner of the aluminum block
can be ground so that the slave bracket can be rotated
slightly."

Quoted from ERA manual.

I don't use the spacer and have no issues. 12,000 miles and all is well.

John