I was looking to upgrade my wires, plugs, cap and rotors. But for some reason when it comes to exact fitment, why do these fit pretty much all other 5.2's but not the '95 Dodge B2500 5.2

Why do these wires fit the 5.9 but not the 5.2 according to summit and amazon. But all other wires fit both in most applications.
https://www.summitracing.com/parts/tay-74676/overview/year/1995/make/dodge/model/b2500

Same for this, Cap, fits 5.9 and 5.2 on most dodges but not the 5.2 on my van?
https://www.amazon.com/gp/product/B000BWDWES/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1

And this Rotor, is the same.
https://www.amazon.com/gp/product/B000BW8NLA/ref=ox_sc_act_title_2?smid=AVM1Z79WGIB6T&psc=1


Has anyone upgraded to Iridium Plugs?


I was thinking about getting these. I know they fit, lol
https://www.amazon.com/dp/B00515NJTI/_encoding=UTF8?coliid=IJB9KLPP58JYX&colid=1ZQC9L5ILWN7A



Take Care,
Kevin