#1 tiller help
 

I’m in the process of rebuilding a model #1 tiller for my 149 and have question on the chain case. I’ve disassembled the entire unit, cleaned everything up and inspected all parts and found everything to be in pretty good shape ( for a 40 year old tiller) except the bearings. So I ordered all new bearings and the felt seals and am in process of reassembling unit but I see in the parts breakdown for it that they’re calling for “2 adhesive dust seals” part # 485250 R1.
I am unable to find any reference to these anywhere except in the parts breakdown and they are listed as NLA. Does anyone know what these are, where they go, what they look like, where I can get them or even if I need them in there?
I’d hate to put it all back together and find out I have to take it all back apart.
Any help would be greatly appreciated.
Thanks in advance