The standard red oil pump spring is the stock pressure, I don't think Mopar or anyone else ever made a " low pressure " oil pump bypass spring. shruggy
You can cut or grind the end of the spring down to reduce the overall length which will lower the oil pressure some wrench scope
Why do you want low oil pressure? confused shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)