looking for universal cross reference for part number

[firebird1158]

I found these universals after much searching but wondering if anybody knows of a cross reference number or somewhere else to get them

http://bpi.ebasicpower.com/mm5/merc...&Product_Code=BPI94-94100&Category_Code=VOL3A

part number for ebasic power is BPI94-94100

why are they so expensive compared to all other u joints??

thanks for any help