On the right hand side is a bearing retainer (the c-shaped piece held by a screw at each end) which, er, retains the roller bearing on the end of the drive shaft.
See first pic.
Now, I was sure that there should be a cover or blanking plate under the retainer - and there is a picture in the workshop manual which shows such a cover in place, see second pic.
The mystery is that I cannot identify this part in the parts books that I have, and so can't order a replacement

Can anyone i.d. this part for me?
Thanks.