I have designed a 3D model of the Estes PRP-1G fin can that was used on kits such as the Estes Challenger-1 and the Kadet among several. I have included several variations with a few more in the works.
Here is a list of model rocket kits that have used this fin can.
Kit# 1235, No. 2 Sky Writer #2
Kit# 1260, No. 2 Estes Sky Writer #2 (same kit, different package)
Kit# 1328, Kadet
Kit# 1333, Scorpion (used 2 fin units) (early production kits)
Kit# 1416, Challenger-1 (starter set)
Kit# 1418, Star Trek (starter set)
Kit# 1420, Star Wars Proton Torpedo (starter set)
Kit# 1438, Dune: The Guild Heighliner (starter set)
Kit# 1447, America (starter set)
Kit# 1993, Lancer
Kit# 2026, Athena
Kit# 2042, America

https://www.thingiverse.com/thing:4554892