DESIGN CHANGE!
There are two versions of the 8 and 74F parts. One has the hole closer to the shaft so that the spring leg must drop straight down into the hole. The other, the hole is farther out from the shaft and the spring long leg goes out sideways and bends around to hook on.
When we order, we get the ones that go farther out from the shaft, so as of 12/2018 we are calling that the newer design.
Penn did not change the part numbers after they changed the parts.
If you need to order a new #8 main gear, make sure you order another #74F as well, so that they are compatible!
8-SSV6500LL main gear requires matching 74F-SSV6500LL spring