Man you got links ready to go for everything. And you always have multiple optionsReplace them with metal ones. I cant tell by looking if the NPT end is 1/4" or 3/8". Looks liek 1/4" to me though
https://www.racetronix.biz/p/adapter-qd-3-8-male-3-8-mpt-al-blk/qda-38m38mpt
https://www.summitracing.com/parts/...Kb7WiJMqKVQV0WbTfp006Lbu_XXYiaaBoCO0AQAvD_BwE
https://performancefuelingsolutions.com/products/small-brass