i read on here that in the light fittings are as follows
brake t20
reverse t15
rear indicator t15
side indicator t10
parker t10
low beam h4
high beam h1

however i just got some led t10's and they plugged straight into the reverse and rear indicator.....
is this because the pins are almost the same???? i thought the wedge was 5mm different.....
is this because they actually take a t10 not a t15 or what else......
i know this is a stupid question but if infact it is a t10 i just wanted this cleared up as i have purchased some t15's off ebay i am now no longer going to need....

T10 and T15 are pretty much interchangeable ,but a T20 is too big.