Warning: I have only validated the drivers side. The passenger side should be a mirror copy but I have not confirmed.
The original T-top handles are no longer in production, brittle, and used examples are hard to find. Also in my opinion, Nissan designed the lock/latching system in a way to encourage the handle to get broken. The handle locks in the latched position (good) but it also locks in the unlatched position (why). If you forget to unlock it when closing it you will just press harder until it breaks.
I sent the model off to Xometry (my buddy works there). Recommend going with ABS to deal with heat/warping and as solid as you can afford. Also the fit isn't perfect but it should get you functioning again. All together the costs were around $25 USD as of 2020.
The cover picture is of a PLA version to verify fit. The second picture is of it printing handle side down to get a decent texture. The third picture is while assembling the T-top.
Take your time with the assembly, there are lots of springs and clips that are finicky and easy to lose. Also I modified my locking system to allow me to latch and unlatch the t-top without using the lock slider or key. I have not had any issues with vibration unlatching the handle and it prevents the replacement handle from breaking.
The author marked this model as their own original creation.