Are these or are these not the correct plugs for my 1990 200TQ 10V? I know the WR7DP's are a no no, but at $7.60 CDN (~$4.50?US)these seem to be the right plug. Supply here is plentiful. Peter Berrevoets 1990 200TQ 10V About to install new inectors, fuel filter and silver spark plugs