Hi Mf,

Bearing shops would have a seal or ring a local mower shop ,if you get the seal out and measure the seal size eBay should have the seal
or get the equivalent Honda seal from eBay.

Specifications
Description:Honda and Victa Oil Seal
Replaces OEM:Honda: 91252-888-003, 91201-ZG9-U71
Fits:Bottom Crankshaft Seal on models - GV150, GXV120, GXV140, HR194, HR214, HRM215 Harmony, HRU194 Buffalo, HRU195 Buffalo (China), HRU195D Mulch, HRU195M Buffalo, HRU214 Buffalo, UT215 Utility Mower.
Fits:Top Crankshaft Seal on models - GXV160, GXV160K1, HRC216K1 & HRC216K2 Commercial Mowers, HUT216 Utility Mower.
Fits:Drive shaft Seal on models - HRU215 Buffalo, HRU215M Buffalo models
Fits:Reduction Cover Seal on models - GX120K1, GX120U1, GX160K1, GX160U1 models.
Fits:Also fits Victa V40 engine models as the PTO seal.
Brand:Honda - Non Genuine,
Product Line:Seal, oil,

https://www.ebay.com.au/itm/325363125509

https://www.ebay.com.au/itm/130611803434

https://www.hendersonmowers.com.au/...---victa-oil-seal-suits-selected-models.

Cheers
Max.