I have been collecting parts for my car since I bought it in 1989, the car was already missing the front bumper guards at that time and I knew they where rare, even finding a picture with a 69 or 70 with them on is difficult. But all my documentation indicated that it came with front bumper guards, so over the years I have managed to collect 3 NOS sets and 2 very good condition used. So yes I have front bumper guards.
I don't know what the correct SSST is for my 1970 do you have any pics, and yes I believe it does have a cool factor, I never intend on inflating the tire and do have a full canister in very good condition but need to remove some sticker glue (how I have no idea without damaging the original red paint) as I believe it had a Chrysler sticker all the way up before.
Added pics of my SSST, I will probably glass bead and repaint it, but it has never been mounted as there are no marks on the bolt holes, and the tread is prefect.