American Standard EP-68 with Honeywell L4008 Operating Limit Control

julesred

Hi, everybody. I'm hoping somebody can guide me to where I might be able to find a replacement part to service a (70s?) American Standard EP-68 electric boiler. I have been able to find a sequencing switch. Specifically, I need to find a Honeywell L4008 OLC "with 18" capillary, 5F to 30F adjustable differential with 30F factory setting and mechanical stop at 220F."
I have found similar new (read: modern) OLCs, but they either have a 55" capillary or the limits are different.
I'm trying to troubleshoot the boiler in my grandfather's old house, which heats, but does not cut off when it reaches the thermostat set temp. Does anybody have thoughts on where I might find this part, as Ebay and the interwebs do not seem to deliver me a solution when I search specifically for the parameters listed above. I do have the original manual if that would help guide anybody in assisting me. All of the service providers that have looked at it want to sell me a new boiler to the tune of $k.
Thanks in advance!