I wish I could help explain how to fit it but I've never owned a standard Rc18 so am not sure exactly how much space there is (or isn't).
My guess is that if you take the servo back to them, along with the car they will sort you out. The HS81 / 82 are very popular at my local micro club and with good reason so it is understandable that the shop may have sold many to micro drivers and be under the impression that they fit ..... without realising the RC18 in TINY!!!
IIRC the servo your looking for is the HS56MG, I think that would be a near direct replacment. I also know of 2 people with the HS65MG in the standard plastic chassis.
I have to say that given the chance I'm sure the model shop will help you out, not the best cause of action to jump straight in with a nasty comment.
I've been involved with this sport / hobby since 1987 and in that time I have dealt with a lot of shops (been sponsored by 3 different shops) and I have to say that in all that time I have only ever met one shop keeper that wasn't genuinely interested in helping their customers enjoy this hobby.
I have to say though that with the amount of non UK sourcing that is going on at the moment increases it will only be the very best (luckiest???) LHS that survive as supporters of racing .... please don't publicly flog those that are surviving!
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