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Just google for 8KC3-0726-0250 and you will find many shops that sell the 25cm version. The 25cm version is a very close fit but it will fit. I ship the v4.1 with the 30cm version because it is much easier for the mass production process and for user installation experience.

I ask all of my resellers if they are interested to sell the 30cm riser only and there was no interest so there is no option to buy it.