Outside of a period of time, generally the mid '00, I have been fine with any Rick bass neck. As to your own need for a lightweight instrument, Id check out the recently discontinued 4004 series of basses. The two 4004L models I have are nice and light with comfy (to me) necks.Which Ric model is the most comfortable to you? I think the 4001 has the skinniest neck if I recall correctly but a lot of people like the 4003 instead.
There is no hard and fast rule as to neck dimensions between the 4001 and 4003 models, but for the most part the older, say, pre 1975. 4001 necks are very thin.
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