I once compiled a list of equivalents to suit the Norton type filter head (below). Availability of them comes and goes. At the moment the Borg and Beck can be had from ebay sellers - the attraction with this one is that the B&B sticker can be peeled off leaving a plain black filter, instead of having a multi-coloured lump on the bike.
A10 oil filters: (same as fitted to Citroen 2CV & Peugeot 205 & 309) UFI part number (23.105.00) corresponds with;
AC Delco FX0011 (was X4A)
Champion 101
Cooper Z64
Fiaam FT4654 or FT 4847
Fram PH2839, PH2864A
Halfords HOF216
Knecht OC 5 (equivalent to Ducati #065149960 and #090549960)
Mann & H W712/9, W712/11
Motorcraft EFL 47
NAPA: 1352 (1352NAPA and 551352 on the box)
Powertrain FL125
Purflux LS131
Purolator FC 103 or OC 5
Tecafilter Ref OC5
Technocar R12, R72, R434
TJ FB2094
Unipart GFE 201
Ryco Z93,
Wix 57314 W1710
Purolator L17601
Borg & Beck BFO 4180