this blimp was a product of ARRI Inc. (ARRI US) or ARRI CSC (Rental) made for SR1. SR2 should fit as well.
SR3 is a larger camera, without testing my colleagues think the camera (viewfinder unit) won't fit. Also, the SR3 runs on 24V whereas SR1 and SR2 run on 12V.
Besides, brochures state around 8 db (A) less noise for SR3 (non HS version).
SR1: 28 +/-2 dB (A)
SR2: 26 +/-1 dB (A)
SR3: 20 +/-2 dB (A)