Spacer required for Rega P3-24 & AT440MLa?

Just ordered a Rega P3-24. I plan to use my existing AT440MLa cartridge on it. Will I need a tonearm spacer? If so, which one, and where do I get it?
I don't know if you will need a spacer but if you do try a bicycle shop. You can get the washers for a lot less money. IMO your best bet would be to get an adjuster like this.

VTA Adjuster
No spacer is needed with the A/T
2002ss335, The VTA adjuster you recommend will not work with the RB-301 tonearm. It has a different mounting scheme, 3 point bolt pattern.