Rare color combo on 1988 coupe. Also posted in convert. in error...sorry.

I have a 1988 corvette coupe.
Exterior is 74 Dark Red Met.
Interior is 732 Red leather.

Have build sheet factory combo. If I am reading chart below correct this must be a special order of some sort. Anyone know how to find actual build amount of cars built with this combo?

Exterior/Interior Color Options
RPO Exterior               Interior       Soft Top       Production
13 Silver Metallic         BK-G-R-S       BK-W           385
20 Medium Blue Metallic    B-BK           BK-W           1,148
28 Dark Blue Metallic      BK-S           BK-S-W         1,675
35 Yellow                  BK-S           BK-W           578
40 White                   B-BK-G-R-S     B-S-W          3,620
41 Black                   BK-G-R-S       BK-S-W         3,420
66 Dark Orange (Pilot)     NA             NA             5
74 Dark Red Metallic       BK-S           BK-S-W         2,878
81 Bright Red              BK-GR-R-S      BK-S-W         5,340
90 Gray Metallic           BK-G           BK-W           644
96 Charcoal Metallic       G-S            BK-S-W         1,046
40/41 White/Black          W              NA             2,050

Interior Color Codes
RPO Color Production
19C BK/C        NA
60C S/C         NA
113 W/L         2,050 (s)
192 BK/L        3,747 (s) - 3,087 (b)
212 B/L         919 (s) - 789 (b)
602 S/L         1,757 (s) - 1,449 (b)
732 R/L         2,913 (s) - 2,492 (b)
902 GR/L        1,338 (s) - 1,226(b)

Any help greatly appreciated.