Hello Guys!!! Greeting from Manila, Philippines!!!

I ordered the Associated Long and Short Outdrives Part#3912
These are the metal/steel outdrives.

Can I just use these to replace the plastic outdrives that came with my FT-TC3?? The Drive rings in the stock diff has some sort of a Letter D in the middle, but the long and short outdrives don't seem to be a match?

what will I do?? Help!!

Thanks