Clean or Replace the York Evaporator Coils of 2 units with 30 yr old Part# U20-36C is not available, need Compatible replacement if Need it.

I have a project that requires a replacement of two evaporator coils belonging to York brand with a part# U20-36C which is no longer available. I need a freelancer to find a compatible replacement part and also to install the replacement part. This is a residential project. The evaporator coils are over 30 years old, so compatibility is of utmost importance. I need someone with an extensive knowledge in evaporator coils replacements to find the right replacement and install it properly. I am looking for history and references to verify the capabilities of the freelancer.
The Heater Unit is made by York Model # MBA 060 47903 Serial # 940318134