Hi philwhitelaw,
This is a Briggs&Stratton filter (p/n 795990) under swing arm on my flash.
Ivo
FWIW
All mower filters are around 25 micron with around 10psi bypass valve & anti drain back valves
The yellow ( high capacity ) ones have 1/3 more paper in them but are not really value over the standard black ones unless you want to run 3 years between oil changes.
The smallest mower filter is the MTD one which is 2.675" dia x 2.125" tall if you are really pressed for space threaded 3/4-16 NPT
MTD No 951-12690 They are about 2/3 the price of the Briggs short Std or 1/2 the price of the Briggs extended life you are using now.
All the rest are 3" diameter and the shortest is the Briggs short you are currently using
3" dia x 2.75 height threaded 3/4 - 16 NPT
For metric then the smallest is the Honda 15400-PLM-A02
At 2.625" dia x 2.5" high
Threaded 20 x 1.5 mm
Being Honda naturally it uses a finer screen at 20 micron
Only slightly larger is the Honda 15400-PLM-A01
2.6875" dia x 3" high.
This is what goes into all of the industrial equipment like skid steers ,tow motors, mini excivators, fork lifts etc
It is 27 micron threaded 20 x 1.5mm
All of the above are very common thus not particularly expensive and most can be bought from after market suppliers in 12 packs which makes them cheap enough to be changed monthly.