Hi,
not sure about the DMP, but from memory the Garda had similar chinscale strap to the RIC but with shamrock hooks. I have a Garda helmet which I can photograph for you, but it will take me a while to find it as I've packed everything away as we're decorating.
Thank You for your reply Jason, I have, for a long time been trying to get a photo or a look at these fittings, so far all the info has been anecdotal. I have been told the fittings from the DMP helmets were used on the Garda ones, with the exception of the acanthus leaf balltop fitting (which I would love a good photo of looking down on it(only seen photos from front, not very good ones)which I think replaced what would seem to be a plain base balltop. All this is heresay without photos of course. If you find the time, drop me a line at mp2fd@yahoo.com
Cheers......Tom.