Spacers to adapt IC3D filament reel to 'cone-style' spoolholder

I already had the type of filament spool holder that uses 'cones' on a threaded rod; I got a reel of IC3D filament (same form factor as Makerbot?) and it didn't fit that holder. I made this set of two simple spacers to adapt the IC3D reel to my existing holders.

These are super simple - They're my first printed things designed in Fusion 360.