GKN (Hardy Spicer) Cross References:
Description: UJ 1310 Series + lube 27x81.8 Standard (RTC3346) = HS166 (boxed) or U166 (unboxed) New GKN Part No: 18196
Description: UJ 1310 Series + side lube 27x81.8 Heavy Duty = HS163 (boxed) or U163 (unboxed)
Description: UJ 1300 Series none-lube 27x74.6 (sealed for life) Standard (RTC3458) = HS161 (boxed) or U161 (unboxed) New GKN Part No. 13872
Description: UJ 1300 Series + lube 27x74.6 Heavy Duty = HS160 (boxed) or U160 (unboxed) New GKN Part No. 18179
Description: UJ 1330 Series + side lube 27x92 HD (external circlip) = HS173 (boxed) or U173 (unboxed) New GKN Part No. 11772
The GKN (Hardy Spicer) range is available through most major distributors or can be purchased directly from their Uni-Cardan Service Centres (new / repair propshafts etc):
Birmingham: 0121 313 1661
Leek: 01538 384278
GKN Driveline Service Website
I hope this information helps.