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I use the RRS L84. It is 91 mm long.
If I were to do it again I would buy the Wimberley P20, as at 98 mm hit s slightly longer and would be easier to get a balance with the various lens / camera combinations I use.
Either of these should work fine if your Giottos uses the screw clamp, but if it uses the lever clamp the RRS and Wimberley feet most likely won't fit the way you would like (they are too wide).
Thanks Jimbo. Yes, my Giottos is a screw clamp. The extra 648 plate I have is 90mm I believe, but I thought it would be too long for the tripod collar foot. Maybe I'll have to look closer...