Servi Car Primary Cover Info needed

[Paps]

I have been trying to find this info out for quite a while now with not very good results. The electric start Servi Car came with with an early or late version electric start system on them. Both of these systems used different components including different inner and outer primary chain covers. The early version used part #60621-64 inner cover and part #60504-64 outer cover. The later version used part #60621-66 inner cover and part #60504-66 outer cover. My question is this. What is the differences in the two covers, both inner and outer? Pics would help immensely. Thanks in advance, Paps