1995 Chevy Truck Ball Joints

Alright I need to put this to rest this has been bugging me for a long time now and I need to know the right answer. I Have a 1995 Chevy K1500 Ex.Cab Short box and I have buying new parts for my truck for this summer and one of the things I need to replace are my upper and lower ball joints. they arnt bad at the time being BUT… They are original and VERY VERY VERY Rusty… So it is time for new ones. Here is my question that is bugging me what is the LOWER Ball Joint size? I don’t want to buy it and have it shipped to me and have it all apart and have it be the wrong one….so if any info you have that would be great.