Ones like birdzgarage mentioned would be my first choice, although they can be hard to find. I have been looking for some 4" ones for a long time now. 3-1/4" is easier but not that much easier. KKT Lightning, that were also mentioned look like this, and MKS also make one very similar. The MKS one is still available new. The ends will be smashed flat if they have been used much. KKT Lightning pictured:
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