GOOD YEAR BLUE STREAK TIRE ID # ??

[Vettefinderjim]

A good friend just found and bought these GOODYEAR BLUE STREAK 7:00X15 RACING tires for his 63 race Corvette. Does anyone know what these numbers mean?
LE11742R
LE11779R
LE11133R
LE51259R
LC51713R

[SBR]

Jim,
Here goes,
L 1968
E November
1 Manufacturer: in 69 the code was 0 so I am not sure of this one.
1 Location of plant, Akron, Ohio
74 Size of tire, code is unknown
2R Type of tire, code is unknown.
I am going off the info provided from the Rick Bizzocco 1969 guidebook for Corvettes. He talks about Goodyear tire codes in there.

[1967Z28]

I've also got some old Goodyear Bluestreak racing tires and would appreciate help with the codes.
Size 5.25/9.50-15, codes TU61711R and TU51016R
Size 6.00/10.00-15, codes TN41329R and UR31243R

I also have a Firestone Super Sports Indy racing tire and would appreciate any help there as well.
Size 9.20-15, code 577-S0510

Thanks.

[SBR]

The letter T or L was used in 68 with the letter J or U code in 69. No one has figured out what the codes are for the Firestones.

[1967Z28]

Thanks. I appreciate your help.