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I swapped a few messages with that seller randr.2012 He says he is a camera technician, this was his last msg:
Hi, was unaware of the .6mm difference in the solenoids and the effect this can have but after reading [your] post on the forum I will take this listing down until I have checked all my current stock.
I replaced my own K50 with an SLR solenoid 7 years ago and have had no further issues with over 83,000 actuations.
Thank you for bringing this to my attention
Kind regards
Richard
I suggested to him to chip in here but I am not sure if he is a member.