Does anyone have a part no. for a 'substitute' thermostat to fit an '88 Venture. I have read past posts on a NAPA #156 substitute but went to my local NAPA store today and they can't come up with any number like that...the guy tried different number/letter/code combinations but couldn't get anything to come up. Is the OE thermostat 180 degree? And is /was the NAPA 156 the same temp. rating? Appreciate any input anyone has on this. Thanks!