The hoses below are manufactured by Continental (CRP) or are original BMW. Quality is excellent. ABA stainless steel hose clamps are available at a deep discount (see http://www.ultimategarage.com/abaprice.html for details) with
Thermostat ByPass Hose - M3 (88-91) - 11531309669 (genuine BMW) - $45.00 (additional $6.50 for a set of 3 ABA stainless clamps)
Coolant Hoses - M3 (88-91) - (A) Lower thermostat hose - 11531309668.......$10.00, (B) Upper radiator hose - 11531309680.....$14.00, (C) Upper thermostat hose - 11531309670....$6.00, (D) Expansion tank hose - 17112225399.....$5.00, (E) Expansion tank hose - 11531309667....$12.00
Heater Hoses - M3 (88-91) - (A) Return Hose #1 -64211374908.....$9.00, (B) Inlet Hose - 64211370807........$9.00, (C) Return Hose #2 - 64211381541....$10.00
Breather Hoses - M3 (88-91) - 11151310811 (bottom of air accumulator)......$10.00 , 11151311839........$11.00