I have posted a picture below in the related links section of a picture for reference.
Remove skid plate 12mm bolt
I am pretty sure the xr100 Honda does not have an oil filter at all
no the Honda 450 has a slight bigger oil filter the 450 has a 116 and the 300 has a 113
Oil recommended is 10W30 Oil Filter is HONDA OIL FILTER 15400-PFB-014 / 004 You can find parts online - the engine in that model is a V twin 520cc: Honda GCV520
There is no oil filter bracket. It uses a spin on type oil filter.
No
The oil filter is located behind a circular cover in the lower front center of the engine. This picture may help: http://www.bikebandit.com/suzuki-motorcycle-gs500ek-1989-oil-filter-oil-pump/o/m6049sch236925
sitting on it, it would be under the cover with three bolts on it on the bottom right side of the motor
You can use PH3593A which is a Honda oil filter. There are also other sizes you can use that will fit but they are the Honda brand.
The oil sending unit on a 1997 Honda Odyssey is directly above the oil filter. The oil filter is on the rear of the engine.
KN oil filter #113, Honda filter 2T29, genuine part number 15412-HM5-A10.