Larry - looks like the business.
I have previously messed around with wooden wedges with only middling success. I will make up a centering rig like this one .
I am about to pull out the dash and center console ( yet again ....) and am going to get rid of a badly notched gear shift lever with a new one from one from Mike M. A very nice replacement item I must say.
I have never been very happy with the final position of reverse selection which always winds up only 2/3rds up the gate, and reverse always seems to be difficult to select. I don't know if this is common. All the other selection positions are good OK. I will recheck the ZF selector box bolt clearances and penetrations as per suggestions from other posts , and I have already checked the reverse light switch penetration which seems OK .
Any other suggestions welcome!