https://www.ebay.com/itm/42mm-Long-W....c100229.m3211
i just ordered some Boots a week ago, and saw this just now.
i'm going to make them out of Aluminum Threaded Rivets.
i like the idea of the Boot going over to seal then the grommet style fit inside the hole type.
i believe a Lil' flared end will help grab the Boot.
I' m going to try this on the KM800S build, because it's a dual push rod system.