The following is a tabulation of parts that are readily available at local Parts stores
such as Pep Boys, Auto Zone and the like.
This listing has been culled from eMails found on the Healey List and is believed to be generally accurate.

Part
Found at
Their Part Number
Coil
Almost Any Parts Store
Bosch Blue
Distributor Cap (6 Cyl)
Jaguar
Part number unknown but cap for a 1969-1975 3.8L engine fits
Fan Belt (100)
NAPA
25-11980
Fan Belt (BJ8)
NAPA
7430 0r NAPA 25-9440
Front Wheel Bearings
Auto-Zone
Timkin Set 2 (Small Bearing)
Timkin Set 6 (Large Bearing)
For a BJ8
Filters, Air Bn1 - Bn2 Burgess Filter
Most Parts Stores
UNIPART GFE1002 Will need trimming to fit over captive nuts

Filters, Oil  (For original Canister)
Most Auto Parts Store
Fram CH-820PL
AC33
Motorcraft FL128
Purolator L30052
Quaker State L30052
Filters, Oil (Spin On)
NAPA
1302 or Gold 1516
Filters, Oil  (Spin On)
Pep Boys
Unipart GFE22 or GFE121
Any Parts Store
Wix 51516
Fuel Pump
Auto Zone
E8016S
Fuel Pump
Auto Zone
EP105 (Alternate)
Fuel Pump
NAPA
Facet 610-1051
Fuel Pump
NAPA
NAPA P60504
Fuel Pump
J C Whitney
ZX735344R (same as Facet at NAPA but $30 less)
Fuel Tank Sending Unit Float
Ford Dealer Parts
COAZ-9202-B
Lug Nuts
Pep Boys
Type 1A
Paper Gaskets
Grocery Stores
Paper grocery bags cut to fit.
Plugs
Almost Any Parts Store
Champion N12YC
Plugs
Almost Any Parts Store
NGK std BP6ES
Plugs
Almost Any Parts Store
NGK v groove BP6EY
Plugs
Almost Any Parts Store
NGK platinum BPR6EGP
Plugs
Almost Any Parts Store
NGK iridium BPR6EIX
Plugs
Almost Any Parts Store
NGK BPR5ES
Plugs
Almost  Any   Parts  Store
Bosch W7DC .7mm
Plugs
Almost  Any  Parts  Store
NGK BP5ES
Plug Wires (6 Cyl 4 Cyl avble)
Tractor Supply Company
On Internet
0236693
Radiator Cap
NAPA
703-1411
Radiator Cap
Stant
10206
Rotors
NAPA
EP 44 or EP41
Steering Rod Boot
Hyundai Dealer Parts
56828-21010
Cover-Dust Tie Rod
Third Brake Light
GM Dealers
Part Number 15030176 No modifications necessary.
Third Brake Light
Scottlandyardspares
On line at www.scottlandyardspares.com but needs modifications for proper curvature to fit the rear shroud
Tudor Washer Bottle Paint
Wal-Mart
"Blue Planet" color spray paint
Most Paint Stores
Krylon Short Cuts Ocean Blue Code SCS-034
U-Joints
NAPA
Hardy-Spicer #HS195, 315330
(may be listed as for a 74 TR-6)
Upper Radiator Hose
NAPA
7446 (Needs Trimmming)
Windscreen Wiper Blades

Most Auto Supply Stores
Tridon All Season-Plus Part Number 83P-18R

Will make four blades. Refil includes a backplate that fits the holder on a BT7. There is a clip on one end to keep it in place. Slightly deform the plastic on the other end with a soldering iron to keep the blade retained.