Go online to rock auto.com. Should be able to find some part numbers that work. Need to watch for the Fits GNX, Grand National.
1987 BUICK REGAL 3.8L 231cid V6 Turbocharged : Cooling System : Radiator Lower Hose
Price
GATES Part # 21211 Molded Coolant Hose; 1 1/2" x 28 11/16" Does Not Contain Spring
Lower
Choose: [Wholesaler Closeout -- 30 Day Warranty] (Only 14 Remaining) ($7.59) [Wholesaler Closeout - Private Label Pkg. - 30 Day Warranty] (Only 11 Remaining) ($7.59) [Regular Inventory] ($13.17)
$7.59
GATES Part # 25487 Flexible Coolant Hose (Standard); 1 1/2" x 30"
Lower
$11.01
DAYCO Part # 71756 Radiator Coolant Hose
FI; Lower
FI; GNX; Lower
* Stocked in outlying warehouse--shipping delayed up to 4 business days
$11.52
GOODYEAR Part # 61043 Radiator Coolant Hose; I.D. 1.500"; Length 28"
Curved; Lower; GNX Model; Grand National
$12.34
ACDELCO Part # 26069X {#88908767} 1 1/2" x 28 11/16"
HOSE,MOLDED 2 DOORS; LWR
$15.04
ACDELCO Part # 31641 {#88909262} 1 1/2" x 30"
HOSE,FORMABLE 2 DOORS; LWR
* Stocked in outlying warehouse--shipping delayed up to 5 business days