You want an FS5w71C. in the UK they are from the S13 200sx or the S14 200sx.
Here's my ebay search string for them: "(s13,s14,s14a,200sx,ca18,sr20) gearbox -(auto,automatic) -mazda"
this is an s13 one: https://www.ebay.co.uk/itm/nissan-200sx-s13-ca18det-gearbox-manual/124120072732?hash=item1ce622021c:g:Gb0AAOSw1Aleb6vj&LH_ItemCondition=4
this is an s14 one: https://www.ebay.co.uk/itm/S14a-UK-gearbox-sr20det-manual-5-speed-73k/254581441995?hash=item3b463c85cb:g:40AAAOSw4tBenwyb&LH_ItemCondition=4
they look basically the same. you have to replace the bellhousing with an L engine bellhousing. you have to modify the bell housing, the gbox mount and the propshaft. There are many threads here and elsewhere detailing the mods needed.
Here's my ebay search string for them: "(s13,s14,s14a,200sx,ca18,sr20) gearbox -(auto,automatic) -mazda"
this is an s13 one: https://www.ebay.co.uk/itm/nissan-200sx-s13-ca18det-gearbox-manual/124120072732?hash=item1ce622021c:g:Gb0AAOSw1Aleb6vj&LH_ItemCondition=4
this is an s14 one: https://www.ebay.co.uk/itm/S14a-UK-gearbox-sr20det-manual-5-speed-73k/254581441995?hash=item3b463c85cb:g:40AAAOSw4tBenwyb&LH_ItemCondition=4
they look basically the same. you have to replace the bellhousing with an L engine bellhousing. you have to modify the bell housing, the gbox mount and the propshaft. There are many threads here and elsewhere detailing the mods needed.