Determine if dimension is arc length

Hi there,

I would like to add a custom symbol to the arc length dimension with dynamo. I’ve created a graph to match dimension type name and modify its prefix. However I’d like to determine if the dimension element is an arc length with a more reliable way such as a builtin parameter or smth. Do you have a suggestion to select arc length dimension only?

this is what I’ve done so far, any help is appreciated. thanks

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