Just wondering if anybody out there would know where i could get battery filler caps for the above car.

it has a pair of 6v batteries in with one of each cap missing. me and the customer are struggling to source replacements

no make of battery, but the following numbers on
type 421
gby3031d
sdto

they are yellow caps with 1 inch dia. thread with a pitch of approx 1/8 inch.

tia mark