I did some further research.
388494 and 3842926 - lower boot - round shifter WITH console. Also a Chevelle part.
384431 - boot - round shifter WITHOUT console. Also an Olds F85 (1st design part)
1361008 - upper boot - WITH console (Dan A. - my book shows same number)
As shown in the 1966 and 1973 Buick parts books, I can confirm those numbers.
Note the lower boot pn changed between the 1966 and 1973 books.
Note the upper boot is the same pn for both 65-67 round lever and 68-72 rectangular lever.
There may have been a different boot for early 1965 GS (no consolette). Mark had a different style in his car than the later version.
1966 Parts book:(1966) 388494 seal, lvr. weatherseal to underbody (with consolette)
(65-66) 1361008 seal, gear shift (with console
(65-66) 384431 seal, control lvr (less consolette)
1972 Parts book:(65-67) 3842926 seal, weatherseal to underbody (with console)
(65-72) 1361008 seal, gear shift (with console)
(65-67) 384431 seal, control lvr (less consolette)