1959 3100 shock help

[Tod59]

Hey Guys, I have a stock '59 3100 fleetside. I want to replace the front and rear shocks. Took off front shocks and the number is #39047. On Summits website, that equates to a Gabriel shock (#82047) for a 1957 & 1958.....
NOT a 1959? Why would that be?

For the rear shocks I have #739060 on the shock.....Googled this number and can't find anything. I was looking for front and rear shock options. Any help with part numbers would be great. Why are the rear shock numbers different than the front?

Brothers has stock replacement shocks, BUT, they are $50 each. Way too pricey for me.
What are you guys using for stock replacement shocks front and rear?