the front and rear support bearings are identical part numbers but the part number changed during the 1988 model year
1987/10-1988/04 BEARING ASSY, CENTER SUPPORT, NO. 1 37230-20110 (subs. 37230-20101)
1988/04-1989/08 BEARING ASSY, CENTER SUPPORT, NO. 1 37230-20120 (subs. 37230-20121)
The early model part number is discontinued but the 37230-20121 shows as still available on ToyotaPartsZone.com for $135.89. I don't normally buy through them, but it provides me a preliminary indication of dealer parts availability.