It depends what you want from the plate. The length of the MobSim gates appears to be very close to the stock TH8RS plate, go back to
page 67 on this thread, plain to see in the photos I linked.
(Look at the 4 mounting holes in relation to gates' ends)
...so the biggest difference between the MobSim and the stock plate seems to be that 7th gear is not present.
DSD also offers alternate 4, 5, & 6 speed
TH8RS plates, but like the Mobsim, the gates seem to be similar in length to the TH8RS stock plate (at least from the posted pic, look at the 4 mounting holes in relation to gates' ends).
On the other hand, if you want faster shifting, then a short shift plate like
this one sold by GTP member
itrdc5r is the way to go.
Or find someone you can pay to make one for you like GTP member
Villenueve73 kindly did for me.
They are not as pretty as the MobSim but they do make shifting faster, especially when used together with a shorter shaft or a shift knob like
Product Innovations Hardbar that sits lower on the stock shaft.
EDIT: If you take the time to trawl backwards through this thread, everything in my post has already been covered in great detail by other GTP members.