OK, so I actually went through this a year or two ago - the armor in my JR Speedmaster suit all spontaneously disintegrated at roughly the same time.
What you want is D3O LP1 or LP2 armor. I might have tossed the packaging describing exactly what I got, I will take a look. I could pull the armor out but it's a huge pain (literally hurt myself doing it last time lol) and there's not much written on the from what I remember. There was an extremely handy website somewhere describing what exactly fits what but I can't find it.