Yep, Barry, but you can find early Sportster trap doors with the cover center screw boss:
Sporster 1957 to 1965, with taped boss, -54 part number (i.e same as KH but bored straight for the 2 dowels):
Sportster 1966 to ?, with boss, untaped, -54A part number:
Sportster 1977 and later trap door, for left shifter, boss deleted, -76 part number:
All the best for this end of year festivities...