I am now pretty sure the spd subframe locking kit is
not the same as the Spoon rigid collars (not that it ever claims to be).
To me it looks like the Spoon kit comes with the collars
and subframe locking washers. The SPD kit looks like it just comes with locking washers like it describes.
Spoon
rigid collars are the second line of washers as you can see they are elevated. Notice the taper also.
Spoon locking washers appear to be more substantial.
SPD
I'm not slating spd's product, it's great value for money and from what I've heard is a great product xthumbup. I'm just making it clear that they are not the same as Spoon's rigid collars and never claim to be.
Happy to be proved wrong.This is only from my observations.