I picked up a beaten bargain Superfast Draguar at the Sunday sale. 60 pence. The dome was cracked open and the chroming faded. The paintwork wasn't too bad though.
I adored the Matchbox Draguar as a kid aged 9. It was so damn cool with that blister and all.
Rummaging in my bits box I found a clear Cornetto topper, which could well make a decent dome.
The cracked original is on the left.