I've found a drawing for HYA2782, the door seal that was used on the Mini, and other vehicles, as you'll see below. Rather than just post it I thought this would be an opportunity to provide a bit of a history lesson on the way BMC designed, documented and numbered their parts for those unfamiliar. If you prefer to just drive your Mini and are not fussed about boring details of parts manufacture then feel free to bypass this post. I won't be upset.
Lots of BMC parts were used on more than one model. Generators, alternators, coils, distributors and wiper blades in Minis, Mokes, Morris 1100's and Austin 1800's spring to mind. These parts retained the same part number regardless of the vehicle they were fitted to. There was a single engineering drawing for that part that showed the vehicle the part was first used on but subsequent uses were normally omitted from the drawing.
Some parts used the same material but were of different sizes or lengths to suit different models. Rubber hose, flexible heater ducts and door seals are examples. In the case of our beloved Mini, the same profile door seal (but of a different length) was used on the Morris 1100, MGB and a couple of trucks. These were given a unique part number for the different applications. Rather than having a separate engineering drawing for each of these parts where the only difference was the length and use, a common drawing was produced that included a table showing the list of vehicle applications for that part. The door seal is in that category.
Are you still with me? Haven't fallen asleep yet.
Below is drawing HYA1825 - Chart, Door Sealing Strip. Things to note are:
- The table showing usage as HYA1826/7 (Morris 1100), HYA2637 (MGB), HYA2782 (YDO5 - Mini) and two HYK numbers for BMC trucks WF & FJ CAB.
- The Revisions section shows our HYA2782 Mini seal being added on 20/3/1964, and the seal length being increased from 127 inches to 128.5 inches on 14/10/1965.
- Material used shows a reference to drawing MYH5001.
- The product colour and testing notes.
- The inclusion of holes along the rubber tube 30 degrees from the vertical at 12 inch pitch (increased from 24 inch pitch on 25/9/1963). Presumably the holes are to allow the exit of air when the tube is squeezed. I've noticed these holes on my car's seals.
Further below is drawing MYH5001 (2 sheets).
Sheet 1 shows both components of the assembled part in cross-section - the pinch-weld and the rubber seal. It's a poor quality drawing and a little hard to read, but it has the material specification and gives a separate part number for the pinchweld (MYH5173) and the rubber seal (MYH5174) that together make up the actual door seal. P.S. Note the rogue circlip present during archival photographing of the drawing.
Sheet 2 shows the precise cross-section dimensions of MYH5173/4 and the allowable tolerance zone for manufacturing. The grids are tenths of an inch so the diameter of the rubber seal we are looking for is 0.6 of an inch, or about 15 mm.
I hope all that waffle was of interest to some and will help source the most appropriate replacement rubber seal, and pinch-weld. At least it's now part of the Ausmini knowledge resource that others can refer to in the future.
Attachment:
HYA1825 Chart Door Sealing Strip reduced.jpg
Attachment:
MYH5001 Section Door Sealing Rubber Sheet 1 reduced.jpg
Attachment:
MYH5001 Section Door Sealing Rubber Sheet 2 reduced.jpg
). I'm told the change may have been because the original Australian supplier no longer made/supplied HYA2782 and a suitable direct replacement was the profile in the above drawing, which will fit any wind-up door Mini. 
