Is it mine only or

[Robocop]

Hi
I have a cougar from the second batch of cars from last year,in jan this year i put a alloy gear box on.I have had some play on the transfer shaft or slipper shaft.In the instructions they say fit u3387 which is a ceramic bearing size 5x9x3 now got them today as you have to get a pair and urm to big by 1mm on internal and external diameter.The only bearing that fits is the u3386 which is about 4x8x3 but i have had the ceramic one in since new i just thought i would have a look as i was getting a bit worried about the play in it.
Emailed schumacher today they say that the 5x9x3 is the one to fit but it clearly is not can anyone else confirm that the smaller one is in there cars or did i get a miss made item,i dont think i did but when you get told the larger bearing should fit hmm.As all the other cars i have had from schumacher no problems.
Thanks