Brackets and straps aren't always the answer. Here they're simply not needed. Just add a few screws.
I owned a very similar garage, circa 1958. It experienced many heavy snow years in its lifetime and didn't show any sign of problems despite having only two rafter ties. You have twice that many, so the concern is halved. A few 2-1/2" construction screws (piloted to prevent cracks) tightened things up nicely and added more shear strength. That's all that's needed. Pilot full-diameter through the first member to allow slip, and roughly half into the second.
Brackets must be rigidly fastened or they don't prevent sag due to positional shift. They may prevent catastrophic failure, but you want more than that. You want a positive position lock. Unless you find a bracket that's exactly suited to your situation and install it very well, it's just an unnecessary expense that doesn't accomplish much.
If you insist, avoid bends, which can flex. Any long, flat strap of heavy gauge steel will do. It needs to be long enough that the effect of the 1½" offset is diminished. Something in the range of 18-24" would be fine. Fasten it to the face of the assembly showing the full rafter tie with 4-6 screws at each end.