Actually may have just found a gates belt - 4PK 1710 for k3 1.3 w/o air con?! Literally 2 mins after posting this lol
4PK1755 is the standard one, so 1755-1710=45mm shorter…seems lacking but i guess its right unless theres some sort of an idler that sits where the AC should be?
So assume just remove all ac parts, remove pump and replace v belt with shorter one and done?
Other places have the 4PK1700,1705 and 1708 listed lol…its close and im sure the slack will be taken up but itd be good to know if its simply delete the ac…and what the cars running no ac are running belt wise on the 1.3