Hi, Two years ago I bought this '50 Shoebox from a guy in Miami and shipped it to the Netherlands. At the moment I'm tearing apart my flathead to check out what state it is in. When my car arrived one of the things I noticed was the fact that it had two different heads, one was an 8BA and the other an 8RT. Of course, there's not really a physical difference there, only the model of car it went into. But now we took the intake off and found this (see attachment). One of the springs is completely different, and I believe the retainer as well. The other retainers look more like the 1951 type (part 6517), right? As we don't have any other material to compare with, I'm turning to you guys! Thanks in advance! Posted using the Full Custom H.A.M.B. App!