Explanation helper for Boom Spare Platinum Boom End variants:7a) => DTW - Platinum Boom End Mega Slim 140-180 (19mm)7b) => DTW - Platinum Boom End Mega Slim 150-200 (19mm)7c) => DTW - Platinum Boom End 140+150 (23,5mm)7d) => DTW - Platinum Boom End 160-220 (23,5mm)7e) => DTW - Platinum Boom End 170-2307f) => DTW - Platinum Boom End 190-2507g) => DTW - Platinum Boom End 190-250 (oval)7h) => DTW - Platinum Boom End 240-290