I'm trying to put a Tokheim 620 together from various parts. I have the base, pump mech, new skins and the collar for a 620. I also have from another pump the upper portion of a Tokheim visible. The one collar has id tags that says its a 620. The other one has no id tags. Both collars are different. One the legs screw in and the other you would use two large nuts. My question is do I have the right collar/cylinder base to make the 620 or do I have one that goes to a different pump. I can email someone pics of what I have. That might make it easier to explain.