Latham makes very good products, not cheap comparing to IMCO, but the after sale service is very good as you can see,I've never used IMCO too . For the use of my boat I prefer as I wrote you SEA STAR pro or new design LS. Everyone prefer to use one brand or another
Yes your system is a bit complicated for the purpose.
After the look at your pictures the sales service from Latham wrote me this:
Yes, that does appear to be an old Latham Marine chrome plated brass steering cylinder! If you ever have questions about the cylinder please contact us. The cylinder will have a four digit serial number on it. If you look at the bottom of the “U” shaped end of the cylinder body close to the transom you will find our name and the serial number. If you tell me the cylinder serial number I can look it up and find out when it was sold and to whom it was sold.
Please use the Hynautic instructions I provided to properly fill and bleed your steering system. If you have any more questions please contact us.