Andy was looking for some parts and I sent him an updated price list from the source I use.  Prices seem pretty inexpensive so I'm posting it here for whoever else needs items.  I have nothing to do with the company, just a customer.  After being quoted $125 for a single belt tensioner by the local Subaru dealer, I nosed around and found these folk.  Parts they sell are made by ITM.  This list is for EA-82; I've asked them to give me a list for the EA-81 and I will post that when I get it.  They don't carry oil pump gaskets, unless it's in the full gasket set, which I don't know.  If there's an item you're looking for that isn't listed here, contact them.  
  
EA82  OHC MPI 85 - 90 SUBARU  1.8 (1781cc) H4 
1800, Loyale, XT w/Multi Point Injection, Carb, SPFI 
  
RY6527     Piston/ring assy. ( X 4) . . . . . . . . . 30.00 
                 (std., 20) ? ? 
021-6124   Piston rings set. . . . . . . . . . . . . . . 35.00 
                 (std., 20, 30) ? ? 
4B9597     Rod Bearings. . . . . . . . . . . . . . . . . 19.55 
                 (std., 10) ? ? 
3M8295    Main Bearings. . . . . . . . . . . . . . . . .27.70 
                 (std., 10, 20, 30, 40) ? ? 
                 (O/S sets contain O/S flange - ask more) 
RB4580    Rod bushings . ( X 4) . .  . . . . . . . . . .3.00 
RV9380    Intake valve. . . . . . . . . . . . . . . . . . .  8.66 
RX9363     Exhaust valve. . . . . . . . . . . . . . . . .  10.95 
VG1100CI Valve guide (int) . . . . . . . . . . . . . . .. 2.31 
VG1103CI Valve guide (exh) . . . . . . . . . . . . . . .2.15 
SS300      Valve seals (int) . . . . . . . . . . . . . . . .2.20 
SS301      Valve seals (exh). . . . . . . . . . . . . . . 1.47 
056-5143   Valve lifter . . . . . . . . . . . . . . . . . .  16.80 
057-1147   Oil pump. . . . . . . . . . . . . . . . . . . . 79.15 
4115         Timing belt (left) . . . . . . . . . . . . . . . .8.83 
4116         Timing belt (right) . . . . . . . . . . . . . . .8.52 
60214       Timing belt tensioner (left) . . . . . . . .19.17 
60215       Timing belt tensioner (right) . . . . . . .20.19 
60216       Timing belt idler (cogged). . . . . . . . .27.23 
09-01323   Full gasket set . . . . . . . . . . . . . . .130.88 
09-11311   Head gasket set. . . . . . . . . . . . . .  64.80 
15-01303   Crank seal (front) . . . . . . . . . . . . . .  2.40 
15-01311   Timing cover seal (left) . . . . . . . . . .  2.21 
15-01304   Rear main seal . . . . . . . . . . . . . . . .5.73 
15-01301   Crankshaft seal . . . . . . . . . . . . . . . 1.65 
  
Arizona Wholesale Engine Parts 
836 E. Broadway Road 
Phoenix, AZ 85040-2208 
602/447-0833 
http://www.awep.com/