Hi Karl,
I have an ARRI SR 1 package, but it can easily be converted to Ultra16 without any lens re-centering, yielding an automatic 1.85:1 aspect ratio. So it matches the SR3's 1.66:1 with less work and machining needed, as well as no extra development and scanning cost at the labs. This package includes:
-SR1 Body (great condition, unused)
-Zeiss Zoom 10-100 F2.8
-Extension Eyepiece
-Dual volt battery charger
-2x ARRI SR Cine 60 12 Volt 3AH battery
-3x ARRI SR 400 ft magazine
-ARRI SR Backdoor cover/magazine cover
-ARRI SR LWS-3 support rod base
-Sound Barney
-Rain Cover
-Gitzo G-1504 Professional Tripod with O'Connor Model 50F head
Let me know here or through PM!