Answer's to JFB and Rodney (UFO-LOW).
The edging material is from Elliot Electronics in Tucson (but we both suspect it can be obtained at any well stocked electronics supply store - maybe even Radio Shack), it is designed for irregular holes to prevent chaffing.
JFB - with regards to the bushings, they are a standard metric size - the id/od/length are mm dimensions 24 x 27 x 29 long.
You may be able to pick them up at a standard bushing house....
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