No, haven't posted about the bungs specifically, but to answer your questions:
- Yes, they do fit the original OEM crash bars ....in fact these ONLY fit bikes with OEM crash bars
- I got them from ebay from a seller called crashbobbinprotectors. Mine cost 39.99 in February this year.
I have checked on ebay but the seller doesn't seem to have any listed at the moment. You could try sending them a message but I see they are away at the moment.