bit of an update on this.
i managed to get a mk1 silvia threaded oil cooler tube of Doski (cheers

) but it doent have the threaded adaptor for the block and not sure even if it did it would retro fit to the MK2 block anyway, so i improvised.
this is a threaded adaptor with a thread to match the block one side and the threaded cooler tube the other
next step is your choice.
if dumping the oil/waetr cooler, then a sandwhich plate with balcnking cover to go to a remote filter and seperate oil/air cooler (mocal 13row or similar) can be fitted.
if you want to retain the oil/water cooler like i do, you will need a different tubular adaptor than the mk1 silvia as its too long. going to source a shorter one, so will keep you posted.
gives a bit more room in that area and reduces the weight (both helpful on my car

)
CNH