Thank you, Paul from SWISCO -- it appears your part
84-149 is an exact match. Until you provided the part number, I was not able to find this on your website! Meanwhile, I have purchased the wheels only, and I will be replacing them, by driving out/in the expansion pin, to use my existing assembly. Thanks for the advice -- but in the end I was too impatient for it, and I got the wheels alone, to solve my problem. I will turn to you for any future needs.