That form of DOT codes started during the '71 calendar year.

BAL7 CU1402
BA = UNIROYAL GOODRICH TIRE MANUFACTURING AKRON OHIO UNITED STATES
L7 = size
CU1 = type
402 = 40th week of '72 or '82
painted code L7 CU 9 29 34
L7 = size
CU = type
9 29 = September 29 (40th week)
34 = ??

BFL7 CU1 337
BF = UNIROYAL GOODRICH TIRE MANUFACTURING WOODBURN INDIANA UNITED STATES
L7 = size
CU1 = type
337 = 33rd week of '77

Do either or both of these have "FOR TEMPORARY USE ONLY" in large outline letters on the backside? Best guess - GM f-body (Camaro/Firebird).