This guys ad lists it as KB110, but the part number he listed (80243-25700) matches up to a 1/4 vent seal, LH for a 1000 coupe in my b10 parts book.
 
Where as the equivilant part number in my 1200 parts book reads 80243-H1001 and there is no mention of the 1000 part number.
So im guessing he has listed it incorrectly.
 
http://www.ebay.com.au/itm/Datsun-KB-110-Vent-window-seal-New-Old-Stock-Made-Japan-/280873078128?pt=Motors_Car_Truck_Parts_Accessories&hash=item4165570d70
 
I thought I would share this as i doubt these show very often.