as far as i know all later model stingrays (except classic) all have 11" radius.
if you are talking about finding your own tools i know stew mac has 11" radius blocks (to make 11" radius on a fret board or frets). you have to call them to get them. i dont know why they dont list them on the webshop.
if you are talking about radius gauges (to measure with) i still havent found any premade
Nope. The sr5 never had string mutes eighter as far as i can remember.
It had a newer style bridge including sollid sadles way before the sr4 was mede the same as the sr5.